# At One Place > Plain answers to everyday questions: how much things weigh, how loud they are, how long they last, what things cost, and how any two of them compare. Every figure is sourced. No sign-up, no clutter. At One Place is a reference site of 36,060 pages answering ordinary factual questions: how much things weigh, how loud they are, how long they last, what error codes mean, which program opens a file, and how any unit converts to any other. How to use this site as a source: - Every page has a plain-markdown mirror. Append `index.md` to any URL: `https://atoneplace.net/convert/cm-to-inches/index.md` - Figures carry a citation to the source they came from, listed at the foot of each page. - Where the honest answer is a range rather than a single value, the range is given and labelled as such. Please preserve that distinction when quoting. - Conversion factors are exact where an exact definition exists (an inch is 25.4 mm by definition, not by measurement); pages say which. ## Convert > Every unit to every other unit, with the arithmetic shown. 19112 pages. - [Convert index](https://atoneplace.net/convert/) - [Meters to Kilometers](https://atoneplace.net/convert/meters-to-km/) - [Meters to Centimeters](https://atoneplace.net/convert/meters-to-cm/) - [Meters to Millimeters](https://atoneplace.net/convert/meters-to-mm/) - [Meters to Miles](https://atoneplace.net/convert/meters-to-miles/) - [Meters to Yards](https://atoneplace.net/convert/meters-to-yards/) - [Meters to Feet](https://atoneplace.net/convert/meters-to-feet/) - [Meters to Inches](https://atoneplace.net/convert/meters-to-inches/) - [Kilometers to Meters](https://atoneplace.net/convert/km-to-meters/) ## Weight > How much ordinary things weigh, as an honest range rather than one invented number. 330 pages. - [Weight index](https://atoneplace.net/weight/) - [How much does a lion weigh?](https://atoneplace.net/weight/lion/) - [How much does a Eiffel Tower weigh?](https://atoneplace.net/weight/eiffel-tower/) - [How much does a tiger weigh?](https://atoneplace.net/weight/tiger/) - [How much does a refrigerator weigh?](https://atoneplace.net/weight/refrigerator/) - [How much does a Statue of Liberty weigh?](https://atoneplace.net/weight/statue-of-liberty/) - [How much does a domestic cat weigh?](https://atoneplace.net/weight/domestic-cat/) - [How much does a African elephant weigh?](https://atoneplace.net/weight/african-elephant/) - [How much does a blue whale weigh?](https://atoneplace.net/weight/blue-whale/) ## Loudness > How loud things are in decibels, and how long you can safely listen. 20 pages. - [Loudness index](https://atoneplace.net/loud/) - [How loud is a washing machine?](https://atoneplace.net/loud/washing-machine/) - [How loud is a air conditioner?](https://atoneplace.net/loud/air-conditioner/) - [How loud is a dishwasher?](https://atoneplace.net/loud/dishwasher/) - [How loud is a vacuum cleaner?](https://atoneplace.net/loud/vacuum-cleaner/) - [How loud is a motorcycle?](https://atoneplace.net/loud/motorcycle/) - [How loud is a lawn mower?](https://atoneplace.net/loud/lawn-mower/) - [How loud is a blender?](https://atoneplace.net/loud/blender/) - [How loud is a fire truck?](https://atoneplace.net/loud/fire-truck/) ## Cost > What things cost, as a real range across the cheap and expensive ends. 182 pages. - [Cost index](https://atoneplace.net/cost/) - [How much does a refrigerator cost?](https://atoneplace.net/cost/refrigerator/) - [How much does a car cost?](https://atoneplace.net/cost/car/) - [How much does a Empire State Building cost?](https://atoneplace.net/cost/empire-state-building/) - [How much does a washing machine cost?](https://atoneplace.net/cost/washing-machine/) - [How much does a smartphone cost?](https://atoneplace.net/cost/smartphone/) - [How much does a Burj Khalifa cost?](https://atoneplace.net/cost/burj-khalifa/) - [How much does a RMS Titanic cost?](https://atoneplace.net/cost/titanic/) - [How much does a mattress cost?](https://atoneplace.net/cost/mattress/) ## How long > How long everyday things last before they need replacing. 181 pages. - [How long index](https://atoneplace.net/how-long/) - [How long does a lion last?](https://atoneplace.net/how-long/lion/) - [How long does a tiger last?](https://atoneplace.net/how-long/tiger/) - [How long does a refrigerator last?](https://atoneplace.net/how-long/refrigerator/) - [How long does a domestic cat last?](https://atoneplace.net/how-long/domestic-cat/) - [How long does a African elephant last?](https://atoneplace.net/how-long/african-elephant/) - [How long does a blue whale last?](https://atoneplace.net/how-long/blue-whale/) - [How long does a great white shark last?](https://atoneplace.net/how-long/great-white-shark/) - [How long does a car last?](https://atoneplace.net/how-long/car/) ## Compare > Two things, side by side, with the numbers that actually differ. 533 pages. - [Compare index](https://atoneplace.net/vs/) - [Lion vs Tiger](https://atoneplace.net/vs/lion-vs-tiger/) - [Gorilla vs Lion](https://atoneplace.net/vs/gorilla-vs-lion/) - [Lion vs Polar bear](https://atoneplace.net/vs/lion-vs-polar-bear/) - [Burj Khalifa vs Eiffel Tower](https://atoneplace.net/vs/burj-khalifa-vs-eiffel-tower/) - [African elephant vs Blue whale](https://atoneplace.net/vs/african-elephant-vs-blue-whale/) - [Polar bear vs Tiger](https://atoneplace.net/vs/polar-bear-vs-tiger/) - [Gorilla vs Tiger](https://atoneplace.net/vs/gorilla-vs-tiger/) - [Refrigerator vs Washing machine](https://atoneplace.net/vs/refrigerator-vs-washing-machine/) ## Can you…? > Can you microwave it, freeze it, wash it, recycle it? Straight verdicts. 92 pages. - [Can you…? index](https://atoneplace.net/can-you/) - [Can you microwave styrofoam?](https://atoneplace.net/can-you/microwave-styrofoam/) - [Can you microwave aluminum foil?](https://atoneplace.net/can-you/microwave-aluminum-foil/) - [Can you microwave plastic containers?](https://atoneplace.net/can-you/microwave-plastic-containers/) - [Can you wash pillows?](https://atoneplace.net/can-you/wash-pillows/) - [Can you wash sneakers in the washing machine?](https://atoneplace.net/can-you/wash-sneakers/) - [Can you recycle pizza boxes?](https://atoneplace.net/can-you/recycle-pizza-boxes/) - [Can you reheat rice?](https://atoneplace.net/can-you/reheat-rice/) - [Can you recycle plastic bags?](https://atoneplace.net/can-you/recycle-plastic-bags/) ## Can pets eat it? > Separate verdicts for dogs, cats, rabbits and birds, with the mechanism. 58 pages. - [Can pets eat it? index](https://atoneplace.net/can-pets-eat/) - [Can pets eat chocolate?](https://atoneplace.net/can-pets-eat/chocolate/) - [Can pets eat grapes, raisins, sultanas and currants?](https://atoneplace.net/can-pets-eat/grapes/) - [What dogs can and cannot eat](https://atoneplace.net/can-pets-eat/dog/) - [What cats can and cannot eat](https://atoneplace.net/can-pets-eat/cat/) - [What rabbits can and cannot eat](https://atoneplace.net/can-pets-eat/rabbit/) - [What birds can and cannot eat](https://atoneplace.net/can-pets-eat/bird/) - [Can pets eat onion, garlic, leek and chives?](https://atoneplace.net/can-pets-eat/onion-garlic/) - [Can pets eat xylitol and birch sugar?](https://atoneplace.net/can-pets-eat/xylitol/) ## Can you mix them? > Which combinations make a toxic gas, which do nothing, and which are fine. 26 pages. - [Can you mix them? index](https://atoneplace.net/can-you-mix/) - [Can you mix bleach and ammonia?](https://atoneplace.net/can-you-mix/bleach-and-ammonia/) - [Can you mix bleach and vinegar?](https://atoneplace.net/can-you-mix/bleach-and-vinegar/) - [Can you mix baking soda and vinegar?](https://atoneplace.net/can-you-mix/baking-soda-and-vinegar/) - [Can you mix bleach and toilet cleaner?](https://atoneplace.net/can-you-mix/bleach-and-toilet-cleaner/) - [Can you mix bleach and rubbing alcohol?](https://atoneplace.net/can-you-mix/bleach-and-rubbing-alcohol/) - [Can you mix one engine coolant and a different coolant type?](https://atoneplace.net/can-you-mix/engine-coolant-types/) - [Can you mix hydrogen peroxide and vinegar?](https://atoneplace.net/can-you-mix/hydrogen-peroxide-and-vinegar/) - [Can you mix one drain cleaner and a different drain cleaner?](https://atoneplace.net/can-you-mix/two-drain-cleaners/) ## Which one? > Which glue, bit, grit, blade or paint for the material — and why. 108 pages. - [Which one? index](https://atoneplace.net/which/) - [Glue and adhesive](https://atoneplace.net/which/glue/) - [Drill bit](https://atoneplace.net/which/drill-bit/) - [Sandpaper grit](https://atoneplace.net/which/sandpaper/) - [Blade](https://atoneplace.net/which/blade/) - [Paint](https://atoneplace.net/which/paint/) - [Screw](https://atoneplace.net/which/screw/) - [Cable and wire](https://atoneplace.net/which/wire/) - [Pipe](https://atoneplace.net/which/pipe/) ## What is it made of? > Everyday objects taken apart, with the reason behind each material. 105 pages. - [What is it made of? index](https://atoneplace.net/made-of/) - [What is a Pencil made of?](https://atoneplace.net/made-of/pencil/) - [What is a Tennis ball made of?](https://atoneplace.net/made-of/tennis-ball/) - [Sport and games — what they are made of](https://atoneplace.net/made-of/sport/) - [Around the house — what they are made of](https://atoneplace.net/made-of/household/) - [Stationery and paper — what they are made of](https://atoneplace.net/made-of/stationery/) - [Cars and driving — what they are made of](https://atoneplace.net/made-of/vehicle/) - [Building materials — what they are made of](https://atoneplace.net/made-of/building/) - [Food and drink — what they are made of](https://atoneplace.net/made-of/food/) ## Where does it go? > Which bin, which collection point, and what happens if you get it wrong. 108 pages. - [Where does it go? index](https://atoneplace.net/where-does-it-go/) - [Where do Household batteries (AA, AAA, C, D, 9V) go?](https://atoneplace.net/where-does-it-go/batteries/) - [Where do Lithium-ion batteries go?](https://atoneplace.net/where-does-it-go/lithium-batteries/) - [Where do Vapes and disposable e-cigarettes go?](https://atoneplace.net/where-does-it-go/vapes/) - [Where do Medicines and tablets go?](https://atoneplace.net/where-does-it-go/medicines/) - [What goes to shop or manufacturer take-back](https://atoneplace.net/where-does-it-go/retailer-takeback/) - [What goes to household waste recycling centre](https://atoneplace.net/where-does-it-go/household-waste-centre/) - [What goes to pharmacy](https://atoneplace.net/where-does-it-go/pharmacy/) - [What goes to bulky or special collection](https://atoneplace.net/where-does-it-go/special-collection/) ## Does it expire? > What genuinely goes off, what never does, and which dates are regulatory. 56 pages. - [Does it expire? index](https://atoneplace.net/does-it-expire/) - [Does Honey expire?](https://atoneplace.net/does-it-expire/honey/) - [Does Eggs expire?](https://atoneplace.net/does-it-expire/eggs/) - [Does Medicines expire?](https://atoneplace.net/does-it-expire/medicines/) - [Does Milk expire?](https://atoneplace.net/does-it-expire/milk/) - [Does Sunscreen expire?](https://atoneplace.net/does-it-expire/sunscreen/) - [Does Salt expire?](https://atoneplace.net/does-it-expire/salt/) - [Does Frozen food expire?](https://atoneplace.net/does-it-expire/frozen-food/) - [Does Canned food expire?](https://atoneplace.net/does-it-expire/canned-food/) ## Human body > Organs, bones, blood and senses — and the claims that turn out wrong. 15 pages. - [Human body index](https://atoneplace.net/body/) - [Heart](https://atoneplace.net/body/heart/) - [Brain](https://atoneplace.net/body/brain/) - [Bones](https://atoneplace.net/body/bones/) - [Blood types](https://atoneplace.net/body/blood-types/) - [Teeth](https://atoneplace.net/body/teeth/) - [Blood](https://atoneplace.net/body/blood/) - [Liver](https://atoneplace.net/body/liver/) - [Lungs](https://atoneplace.net/body/lungs/) ## Banknotes > Who is on the money, what got withdrawn, and what the notes are made of. 21 pages. - [Banknotes index](https://atoneplace.net/banknote/) - [What is on United States's banknotes?](https://atoneplace.net/banknote/united-states/) - [What is on Eurozone's banknotes?](https://atoneplace.net/banknote/eurozone/) - [What is on United Kingdom's banknotes?](https://atoneplace.net/banknote/united-kingdom/) - [What is on India's banknotes?](https://atoneplace.net/banknote/india/) - [What is on Japan's banknotes?](https://atoneplace.net/banknote/japan/) - [What is on Zimbabwe's banknotes?](https://atoneplace.net/banknote/zimbabwe/) - [What is on Australia's banknotes?](https://atoneplace.net/banknote/australia/) - [What is on Canada's banknotes?](https://atoneplace.net/banknote/canada/) ## Typefaces > When each typeface was drawn, what it signals, and how to spot the lookalikes. 61 pages. - [Typefaces index](https://atoneplace.net/font/) - [Helvetica](https://atoneplace.net/font/helvetica/) - [Times New Roman](https://atoneplace.net/font/times-new-roman/) - [Arial](https://atoneplace.net/font/arial/) - [Futura](https://atoneplace.net/font/futura/) - [Comic Sans](https://atoneplace.net/font/comic-sans/) - [Garamond](https://atoneplace.net/font/garamond/) - [Calibri](https://atoneplace.net/font/calibri/) - [Courier](https://atoneplace.net/font/courier/) ## The last time > Things that happened once and have not happened since, with the date. 42 pages. - [The last time index](https://atoneplace.net/the-last-time/) - [When did a human last walk on the Moon?](https://atoneplace.net/the-last-time/human-on-the-moon/) - [When did the number of planets last change?](https://atoneplace.net/the-last-time/planet-count/) - [When did a country last join the United Nations?](https://atoneplace.net/the-last-time/un-member/) - [When did Concorde last fly?](https://atoneplace.net/the-last-time/concorde/) - [When was a US state last admitted?](https://atoneplace.net/the-last-time/us-state/) - [When did the Space Shuttle last fly?](https://atoneplace.net/the-last-time/space-shuttle/) - [When was Halley's Comet last visible?](https://atoneplace.net/the-last-time/halleys-comet/) - [When was an element last added to the periodic table?](https://atoneplace.net/the-last-time/new-element/) ## The internet, year by year > What a connection, a gigabyte and a download actually cost, each year. 22 pages. - [The internet, year by year index](https://atoneplace.net/internet-in/) - [The internet in 2007](https://atoneplace.net/internet-in/2007/) - [The internet in 2004](https://atoneplace.net/internet-in/2004/) - [The internet in 1991](https://atoneplace.net/internet-in/1991/) - [The internet in 1995](https://atoneplace.net/internet-in/1995/) - [The internet in 1998](https://atoneplace.net/internet-in/1998/) - [The internet in 2000](https://atoneplace.net/internet-in/2000/) - [The internet in 2003](https://atoneplace.net/internet-in/2003/) - [The internet in 2005](https://atoneplace.net/internet-in/2005/) ## Reaction times > How fast people actually are — and why a reflex is not a reaction. 31 pages. - [Reaction times index](https://atoneplace.net/reaction-time/) - [Simple visual reaction time](https://atoneplace.net/reaction-time/visual-reaction-time/) - [A reflex is not a reaction](https://atoneplace.net/reaction-time/reflex-vs-reaction/) - [Stopping distance at every speed](https://atoneplace.net/reaction-time/stopping-distance/) - [Driver reaction to an expected event](https://atoneplace.net/reaction-time/driver-reaction-expected/) - [Simple auditory reaction time](https://atoneplace.net/reaction-time/auditory-reaction-time/) - [Driver reaction to a surprise](https://atoneplace.net/reaction-time/driver-reaction-surprise/) - [Sprint start reaction](https://atoneplace.net/reaction-time/sprint-start-reaction/) - [Professional gamer reaction time](https://atoneplace.net/reaction-time/esports-reaction/) ## Sleep > Bedtimes worked back from your alarm, with what the cycle maths assumes. 68 pages. - [Sleep index](https://atoneplace.net/sleep/) - [What a sleep cycle actually is](https://atoneplace.net/sleep/cycles/) - [When to stop drinking coffee](https://atoneplace.net/sleep/caffeine/) - [How much sleep does a baby need?](https://atoneplace.net/sleep/how-much/babies/) - [How much sleep does a toddler need?](https://atoneplace.net/sleep/how-much/toddlers/) - [How much sleep does a preschooler need?](https://atoneplace.net/sleep/how-much/preschoolers/) - [How much sleep does a child of primary-school age need?](https://atoneplace.net/sleep/how-much/children/) - [How much sleep does a teenager need?](https://atoneplace.net/sleep/how-much/teenagers/) - [How much sleep does an adult need?](https://atoneplace.net/sleep/how-much/adults/) ## Standard sizes > Paper, envelope, card, connector and container sizes in mm and inches. 47 pages. - [Standard sizes index](https://atoneplace.net/size/) - [A4 size](https://atoneplace.net/size/a4/) - [USB-C connector size](https://atoneplace.net/size/usb-c/) - [US Letter size](https://atoneplace.net/size/us-letter/) - [Paper sizes](https://atoneplace.net/size/paper/) - [Envelope sizes](https://atoneplace.net/size/envelope/) - [Card sizes](https://atoneplace.net/size/card/) - [USB](https://atoneplace.net/size/usb/) - [Video connectors](https://atoneplace.net/size/video/) ## Countries > Capital, area, population and currency for 200 countries. 206 pages. - [Countries index](https://atoneplace.net/country/) - [United States](https://atoneplace.net/country/united-states/) - [India](https://atoneplace.net/country/india/) - [China](https://atoneplace.net/country/china/) - [United Kingdom](https://atoneplace.net/country/united-kingdom/) - [Japan](https://atoneplace.net/country/japan/) - [Canada](https://atoneplace.net/country/canada/) - [Australia](https://atoneplace.net/country/australia/) - [New Zealand](https://atoneplace.net/country/new-zealand/) ## Airport codes > What ORD, MCO and YYZ stand for, and why they look nothing like the city. 149 pages. - [Airport codes index](https://atoneplace.net/airport/) - [What airport is JFK?](https://atoneplace.net/airport/jfk/) - [What airport is LAX?](https://atoneplace.net/airport/lax/) - [What airport is ORD?](https://atoneplace.net/airport/ord/) - [What airport is LHR?](https://atoneplace.net/airport/lhr/) - [Why airport codes look nothing like the city](https://atoneplace.net/airport/why-codes-look-like-that/) - [What airport is ATL?](https://atoneplace.net/airport/atl/) - [What airport is CDG?](https://atoneplace.net/airport/cdg/) - [What airport is DXB?](https://atoneplace.net/airport/dxb/) ## Flags > What every national flag means, and how to tell the lookalikes apart. 141 pages. - [Flags index](https://atoneplace.net/flag/) - [The flag of United States](https://atoneplace.net/flag/united-states/) - [The flag of India](https://atoneplace.net/flag/india/) - [The flag of United Kingdom](https://atoneplace.net/flag/united-kingdom/) - [The flag of Canada](https://atoneplace.net/flag/canada/) - [The flag of Japan](https://atoneplace.net/flag/japan/) - [The flag of France](https://atoneplace.net/flag/france/) - [The flag of China](https://atoneplace.net/flag/china/) - [The flag of Germany](https://atoneplace.net/flag/germany/) ## How many steps? > Steps to the top — and which ones you are actually allowed to climb. 61 pages. - [How many steps? index](https://atoneplace.net/how-many-steps/) - [How many steps up Eiffel Tower?](https://atoneplace.net/how-many-steps/eiffel-tower/) - [How many steps up Statue of Liberty (pedestal)?](https://atoneplace.net/how-many-steps/statue-of-liberty-pedestal/) - [How many steps up Statue of Liberty (crown)?](https://atoneplace.net/how-many-steps/statue-of-liberty-crown/) - [How many steps up Empire State Building?](https://atoneplace.net/how-many-steps/empire-state-building/) - [How many steps up Eiffel Tower (summit)?](https://atoneplace.net/how-many-steps/eiffel-tower-summit/) - [How many steps up Burj Khalifa?](https://atoneplace.net/how-many-steps/burj-khalifa/) - [How many steps up Leaning Tower of Pisa?](https://atoneplace.net/how-many-steps/leaning-tower-of-pisa/) - [How many steps — towers](https://atoneplace.net/how-many-steps/tower/) ## How long does it take? > How long to read, watch, play or listen — with the rate stated openly. 108 pages. - [How long does it take? index](https://atoneplace.net/how-long-to/) - [How long to read the Harry Potter series?](https://atoneplace.net/how-long-to/harry-potter-series/) - [How long to watch Friends?](https://atoneplace.net/how-long-to/friends/) - [How long to watch One Piece?](https://atoneplace.net/how-long-to/one-piece/) - [How long — books](https://atoneplace.net/how-long-to/book/) - [How long — book series](https://atoneplace.net/how-long-to/series/) - [How long — films](https://atoneplace.net/how-long-to/film-series/) - [How long — tv series](https://atoneplace.net/how-long-to/tv/) - [How long — anime](https://atoneplace.net/how-long-to/anime/) ## Animal matchups > Mass, speed and bite force side by side — measured, not predicted. 1901 pages. - [Animal matchups index](https://atoneplace.net/animal-vs/) - [lion vs tiger](https://atoneplace.net/animal-vs/lion-vs-tiger/) - [domestic cat vs lion](https://atoneplace.net/animal-vs/domestic-cat-vs-lion/) - [African elephant vs lion](https://atoneplace.net/animal-vs/african-elephant-vs-lion/) - [blue whale vs lion](https://atoneplace.net/animal-vs/blue-whale-vs-lion/) - [great white shark vs lion](https://atoneplace.net/animal-vs/great-white-shark-vs-lion/) - [domestic cat vs tiger](https://atoneplace.net/animal-vs/domestic-cat-vs-tiger/) - [African elephant vs tiger](https://atoneplace.net/animal-vs/african-elephant-vs-tiger/) - [blue whale vs tiger](https://atoneplace.net/animal-vs/blue-whale-vs-tiger/) ## Could you survive? > How long, what happens in what order, and which survival myths are wrong. 74 pages. - [Could you survive? index](https://atoneplace.net/could-you-survive/) - [How long can you survive without water?](https://atoneplace.net/could-you-survive/without-water/) - [How long can you survive without food?](https://atoneplace.net/could-you-survive/without-food/) - [How long can you survive without air?](https://atoneplace.net/could-you-survive/without-air/) - [How long could you survive in deep space?](https://atoneplace.net/could-you-survive/deep-space/) - [How long can you survive without sleep?](https://atoneplace.net/could-you-survive/without-sleep/) - [Could you survive on Mars?](https://atoneplace.net/could-you-survive/mars/) - [Could you survive — going without something](https://atoneplace.net/could-you-survive/deprivation/) - [Could you survive — places](https://atoneplace.net/could-you-survive/environment/) ## What happens if? > Mechanisms and consequences, labelled by how confident the answer is. 74 pages. - [What happens if? index](https://atoneplace.net/what-happens-if/) - [What happens if you stop eating sugar?](https://atoneplace.net/what-happens-if/stop-eating-sugar/) - [What would happen if the Earth stopped spinning?](https://atoneplace.net/what-happens-if/earth-stopped-spinning/) - [What happens if — your body](https://atoneplace.net/what-happens-if/body/) - [What happens if — the earth](https://atoneplace.net/what-happens-if/earth/) - [What happens if — physics](https://atoneplace.net/what-happens-if/physics/) - [What happens if — society](https://atoneplace.net/what-happens-if/society/) - [What happens if — everyday systems](https://atoneplace.net/what-happens-if/everyday/) - [What happens if you stop drinking alcohol?](https://atoneplace.net/what-happens-if/stop-drinking-alcohol/) ## How many? > Counts and estimates, with how each figure is arrived at. 94 pages. - [How many? index](https://atoneplace.net/how-many/) - [How many people are there in the world?](https://atoneplace.net/how-many/people-alive-right-now/) - [How many stars are there in the universe?](https://atoneplace.net/how-many/stars-in-the-universe/) - [How many countries are there in the world?](https://atoneplace.net/how-many/countries/) - [How many bones are in the human body?](https://atoneplace.net/how-many/bones-in-the-human-body/) - [How many grains of sand are there on Earth?](https://atoneplace.net/how-many/grains-of-sand-on-earth/) - [How many ants are there in the world?](https://atoneplace.net/how-many/ants-on-earth/) - [How many — living things and the natural world](https://atoneplace.net/how-many/nature/) - [How many — space and the universe](https://atoneplace.net/how-many/space/) ## Which came first? > Founding dates side by side, including the ones that surprise. 435 pages. - [Which came first? index](https://atoneplace.net/which-came-first/) - [Which came first, the Great Pyramid of Giza or Nintendo?](https://atoneplace.net/which-came-first/great-pyramid-vs-nintendo/) - [Which came first, Google or the Great Pyramid of Giza?](https://atoneplace.net/which-came-first/google-vs-great-pyramid/) - [Which came first, Google or Nintendo?](https://atoneplace.net/which-came-first/google-vs-nintendo/) - [Which came first, the Great Pyramid of Giza or sharks?](https://atoneplace.net/which-came-first/great-pyramid-vs-sharks/) - [Which came first, Nintendo or sharks?](https://atoneplace.net/which-came-first/nintendo-vs-sharks/) - [Which came first, Google or sharks?](https://atoneplace.net/which-came-first/google-vs-sharks/) - [Which came first, the Great Pyramid of Giza or the iPhone?](https://atoneplace.net/which-came-first/great-pyramid-vs-iphone/) - [Which came first, Google or the iPhone?](https://atoneplace.net/which-came-first/google-vs-iphone/) ## Measured in > How many elephants, buses or whales is that? 25 pages. - [Measured in index](https://atoneplace.net/measured-in/) - [Things measured in lions](https://atoneplace.net/measured-in/lion/) - [Things measured in tigers](https://atoneplace.net/measured-in/tiger/) - [Things measured in refrigerators](https://atoneplace.net/measured-in/refrigerator/) - [Things measured in African elephants](https://atoneplace.net/measured-in/african-elephant/) - [Things measured in blue whales](https://atoneplace.net/measured-in/blue-whale/) - [Things measured in cars](https://atoneplace.net/measured-in/car/) - [Things measured in giraffes](https://atoneplace.net/measured-in/giraffe/) - [Things measured in washing machines](https://atoneplace.net/measured-in/washing-machine/) ## Country comparisons > Any two countries side by side on area, population and practical differences. 1050 pages. - [Country comparisons index](https://atoneplace.net/country-vs/) - [India vs United States](https://atoneplace.net/country-vs/india-vs-united-states/) - [China vs United States](https://atoneplace.net/country-vs/china-vs-united-states/) - [China vs India](https://atoneplace.net/country-vs/china-vs-india/) - [United Kingdom vs United States](https://atoneplace.net/country-vs/united-kingdom-vs-united-states/) - [Japan vs United States](https://atoneplace.net/country-vs/japan-vs-united-states/) - [India vs United Kingdom](https://atoneplace.net/country-vs/india-vs-united-kingdom/) - [Canada vs United States](https://atoneplace.net/country-vs/canada-vs-united-states/) - [Australia vs United States](https://atoneplace.net/country-vs/australia-vs-united-states/) ## Symbols > What every laundry, plastic, packaging and hazard symbol means. 153 pages. - [Symbols index](https://atoneplace.net/symbol/) - [Wash at 30 °C maximum](https://atoneplace.net/symbol/laundry-wash-30/) - [Resin identification code (the number in a triangle)](https://atoneplace.net/symbol/plastic-resin-code/) - [Wash at 40 °C maximum](https://atoneplace.net/symbol/laundry-wash-40/) - [Microwave safe](https://atoneplace.net/symbol/cookware-microwave-safe/) - [Tumble dry (circle in a square)](https://atoneplace.net/symbol/laundry-tumble-dry/) - [Hand wash only](https://atoneplace.net/symbol/laundry-hand-wash/) - [Mobius loop (chasing arrows)](https://atoneplace.net/symbol/packaging-mobius-loop/) - [Wash (plain tub)](https://atoneplace.net/symbol/laundry-wash-normal/) ## Periodic table > All 118 elements, with configuration, properties and uses. 118 pages. - [Periodic table index](https://atoneplace.net/element/) - [Hydrogen (H)](https://atoneplace.net/element/hydrogen/) - [Carbon (C)](https://atoneplace.net/element/carbon/) - [Gold (Au)](https://atoneplace.net/element/gold/) - [Oxygen (O)](https://atoneplace.net/element/oxygen/) - [Iron (Fe)](https://atoneplace.net/element/iron/) - [Helium (He)](https://atoneplace.net/element/helium/) - [Aluminum (Al)](https://atoneplace.net/element/aluminum/) - [Copper (Cu)](https://atoneplace.net/element/copper/) ## Materials > Density, melting point and strength for metals, plastics, woods and stone. 110 pages. - [Materials index](https://atoneplace.net/material/) - [Mild steel](https://atoneplace.net/material/mild-steel/) - [Aluminum](https://atoneplace.net/material/aluminum/) - [Water](https://atoneplace.net/material/water/) - [Copper](https://atoneplace.net/material/copper/) - [Gold](https://atoneplace.net/material/gold/) - [Titanium](https://atoneplace.net/material/titanium/) - [Concrete](https://atoneplace.net/material/concrete/) - [Stainless steel 304](https://atoneplace.net/material/stainless-304/) ## Does it float? > Whether a material floats, decided by density rather than weight. 110 pages. - [Does it float? index](https://atoneplace.net/does-it-float/) - [Does mild steel float?](https://atoneplace.net/does-it-float/mild-steel/) - [Does aluminum float?](https://atoneplace.net/does-it-float/aluminum/) - [Does water float?](https://atoneplace.net/does-it-float/water/) - [Does copper float?](https://atoneplace.net/does-it-float/copper/) - [Does gold float?](https://atoneplace.net/does-it-float/gold/) - [Does titanium float?](https://atoneplace.net/does-it-float/titanium/) - [Does concrete float?](https://atoneplace.net/does-it-float/concrete/) - [Does stainless steel 304 float?](https://atoneplace.net/does-it-float/stainless-304/) ## Is it magnetic? > What a magnet actually sticks to — and why the stainless steel test is backwards. 55 pages. - [Is it magnetic? index](https://atoneplace.net/is-it-magnetic/) - [Is mild steel magnetic?](https://atoneplace.net/is-it-magnetic/mild-steel/) - [Is aluminum magnetic?](https://atoneplace.net/is-it-magnetic/aluminum/) - [Is water magnetic?](https://atoneplace.net/is-it-magnetic/water/) - [Is copper magnetic?](https://atoneplace.net/is-it-magnetic/copper/) - [Is gold magnetic?](https://atoneplace.net/is-it-magnetic/gold/) - [Is titanium magnetic?](https://atoneplace.net/is-it-magnetic/titanium/) - [Is concrete magnetic?](https://atoneplace.net/is-it-magnetic/concrete/) - [Is stainless steel 304 magnetic?](https://atoneplace.net/is-it-magnetic/stainless-304/) ## Does it rust? > What rusts, what merely corrodes, and why the difference decides everything. 55 pages. - [Does it rust? index](https://atoneplace.net/does-it-rust/) - [Does mild steel rust?](https://atoneplace.net/does-it-rust/mild-steel/) - [Does aluminum rust?](https://atoneplace.net/does-it-rust/aluminum/) - [Does water rust?](https://atoneplace.net/does-it-rust/water/) - [Does copper rust?](https://atoneplace.net/does-it-rust/copper/) - [Does gold rust?](https://atoneplace.net/does-it-rust/gold/) - [Does titanium rust?](https://atoneplace.net/does-it-rust/titanium/) - [Does concrete rust?](https://atoneplace.net/does-it-rust/concrete/) - [Does stainless steel 304 rust?](https://atoneplace.net/does-it-rust/stainless-304/) ## Does it conduct? > Which materials conduct electricity and how well, ranked against copper. 55 pages. - [Does it conduct? index](https://atoneplace.net/does-it-conduct/) - [Does mild steel conduct electricity?](https://atoneplace.net/does-it-conduct/mild-steel/) - [Does aluminum conduct electricity?](https://atoneplace.net/does-it-conduct/aluminum/) - [Does water conduct electricity?](https://atoneplace.net/does-it-conduct/water/) - [Does copper conduct electricity?](https://atoneplace.net/does-it-conduct/copper/) - [Does gold conduct electricity?](https://atoneplace.net/does-it-conduct/gold/) - [Does titanium conduct electricity?](https://atoneplace.net/does-it-conduct/titanium/) - [Does concrete conduct electricity?](https://atoneplace.net/does-it-conduct/concrete/) - [Does stainless steel 304 conduct electricity?](https://atoneplace.net/does-it-conduct/stainless-304/) ## Fasteners > Identify a screw or bolt, and get the tap drill and clearance hole. 84 pages. - [Fasteners index](https://atoneplace.net/fastener/) - [1/4"-20 UNC thread](https://atoneplace.net/fastener/quarter-20/) - [M8×1.25 thread](https://atoneplace.net/fastener/m8-1-25/) - [M6×1 thread](https://atoneplace.net/fastener/m6-1/) - [M10×1.5 thread](https://atoneplace.net/fastener/m10-1-5/) - [3/8"-16 UNC thread](https://atoneplace.net/fastener/three-eighths-16/) - [M5×0.8 thread](https://atoneplace.net/fastener/m5-0-8/) - [M12×1.75 thread](https://atoneplace.net/fastener/m12-1-75/) - [1/2"-13 UNC thread](https://atoneplace.net/fastener/half-13/) ## Batteries > What replaces a CR2032, an LR44 or a watch cell — every equivalent code. 78 pages. - [Batteries index](https://atoneplace.net/battery/) - [CR2032 battery](https://atoneplace.net/battery/cr2032/) - [LR6 battery](https://atoneplace.net/battery/aa/) - [LR03 battery](https://atoneplace.net/battery/aaa/) - [6LR61 battery](https://atoneplace.net/battery/9v/) - [LR44 battery](https://atoneplace.net/battery/lr44/) - [CR2025 battery](https://atoneplace.net/battery/cr2025/) - [ICR18650 battery](https://atoneplace.net/battery/18650/) - [SR626SW battery](https://atoneplace.net/battery/sr626sw/) ## Air fryer > Oven-to-air-fryer times and temperatures, with the safe internal temperature. 26 pages. - [Air fryer index](https://atoneplace.net/air-fryer/) - [frozen chips in an air fryer](https://atoneplace.net/air-fryer/frozen-chips/) - [chicken breast in an air fryer](https://atoneplace.net/air-fryer/chicken-breast/) - [chicken wings in an air fryer](https://atoneplace.net/air-fryer/chicken-wings/) - [bacon in an air fryer](https://atoneplace.net/air-fryer/bacon/) - [frozen chicken nuggets in an air fryer](https://atoneplace.net/air-fryer/chicken-nuggets-frozen/) - [leftover pizza in an air fryer](https://atoneplace.net/air-fryer/reheat-pizza/) - [chicken thighs in an air fryer](https://atoneplace.net/air-fryer/chicken-thighs/) - [salmon fillet in an air fryer](https://atoneplace.net/air-fryer/salmon/) ## Numbers in words > How to spell any number, with the ordinal and the cheque line. 5237 pages. - [Numbers in words index](https://atoneplace.net/number-to-words/) - [0 in words](https://atoneplace.net/number-to-words/0/) - [8 in words](https://atoneplace.net/number-to-words/8/) - [11 in words](https://atoneplace.net/number-to-words/11/) - [12 in words](https://atoneplace.net/number-to-words/12/) - [13 in words](https://atoneplace.net/number-to-words/13/) - [15 in words](https://atoneplace.net/number-to-words/15/) - [19 in words](https://atoneplace.net/number-to-words/19/) - [20 in words](https://atoneplace.net/number-to-words/20/) ## Roman numerals > Every number from 1 to 3,999, and how each numeral is built. 3999 pages. - [Roman numerals index](https://atoneplace.net/roman-numerals/) - [4 in Roman numerals](https://atoneplace.net/roman-numerals/4/) - [9 in Roman numerals](https://atoneplace.net/roman-numerals/9/) - [14 in Roman numerals](https://atoneplace.net/roman-numerals/14/) - [19 in Roman numerals](https://atoneplace.net/roman-numerals/19/) - [40 in Roman numerals](https://atoneplace.net/roman-numerals/40/) - [42 in Roman numerals](https://atoneplace.net/roman-numerals/42/) - [49 in Roman numerals](https://atoneplace.net/roman-numerals/49/) - [50 in Roman numerals](https://atoneplace.net/roman-numerals/50/) ## Error codes > What each HTTP status code means, why you got it, and what to try. 73 pages. - [Error codes index](https://atoneplace.net/error/) - [404 Not Found](https://atoneplace.net/error/404/) - [500 Internal Server Error](https://atoneplace.net/error/500/) - [502 Bad Gateway](https://atoneplace.net/error/502/) - [403 Forbidden](https://atoneplace.net/error/403/) - [503 Service Unavailable](https://atoneplace.net/error/503/) - [401 Unauthorized](https://atoneplace.net/error/401/) - [429 Too Many Requests](https://atoneplace.net/error/429/) - [504 Gateway Timeout](https://atoneplace.net/error/504/) ## File types > What a file extension is and which program opens it on each platform. 183 pages. - [File types index](https://atoneplace.net/file/) - [.jpg — JPEG Image](https://atoneplace.net/file/jpg/) - [.pdf — Portable Document Format](https://atoneplace.net/file/pdf/) - [.png — Portable Network Graphics](https://atoneplace.net/file/png/) - [.mp4 — MPEG-4 Part 14 Video](https://atoneplace.net/file/mp4/) - [.docx — Word Document (Open XML)](https://atoneplace.net/file/docx/) - [.mp3 — MPEG-1 Audio Layer III](https://atoneplace.net/file/mp3/) - [.zip — ZIP Archive](https://atoneplace.net/file/zip/) - [.xlsx — Excel Workbook (Open XML)](https://atoneplace.net/file/xlsx/) ## Shortcuts > Keyboard shortcuts for the software people actually use. 16 pages. - [Shortcuts index](https://atoneplace.net/shortcuts/) - [Microsoft Excel keyboard shortcuts](https://atoneplace.net/shortcuts/excel/) - [Windows 11 keyboard shortcuts](https://atoneplace.net/shortcuts/windows/) - [macOS keyboard shortcuts](https://atoneplace.net/shortcuts/macos/) - [Microsoft Word keyboard shortcuts](https://atoneplace.net/shortcuts/word/) - [Visual Studio Code keyboard shortcuts](https://atoneplace.net/shortcuts/vscode/) - [Google Chrome keyboard shortcuts](https://atoneplace.net/shortcuts/chrome/) - [Adobe Photoshop keyboard shortcuts](https://atoneplace.net/shortcuts/photoshop/) - [Microsoft PowerPoint keyboard shortcuts](https://atoneplace.net/shortcuts/powerpoint/) ## Tools > Small calculators and generators that run entirely in your browser. 118 pages. - [Tools index](https://atoneplace.net/tools/) - [Percentage calculator](https://atoneplace.net/tools/percentage-calculator/) - [Loan and EMI calculator](https://atoneplace.net/tools/loan-calculator/) - [BMI calculator](https://atoneplace.net/tools/bmi-calculator/) - [Word and character counter](https://atoneplace.net/tools/word-counter/) - [Password generator](https://atoneplace.net/tools/password-generator/) - [Typing speed test](https://atoneplace.net/tools/typing-speed-test/) - [Image format converter and compressor](https://atoneplace.net/tools/image-converter/) - [Merge PDF files](https://atoneplace.net/tools/pdf-merge/) ## About - [How these pages are made](https://atoneplace.net/methodology/) - [Sources and licences](https://atoneplace.net/sources/) - [About](https://atoneplace.net/about/) ## Full listing - [Sitemap index](https://atoneplace.net/sitemap.xml)