Which came first, the hamburger or the lightbulb?

the lightbulb came first, by 21 years. Edison's carbon filament lamp burned for over 13 hours.

Side by side

the hamburger

At least four places claim it. Charlie Nagreen said he flattened a meatball between bread at the Seymour Fair in Wisconsin in 1885; the Menches brothers claimed the same year at the Erie County Fair; Louis' Lunch in New Haven claims 1900; and Fletcher Davis of Athens, Texas is credited with introducing it at the 1904 St Louis World's Fair. No contemporary document settles it. What is documented is the Hamburg steak — chopped beef, no bun — on American menus from the 1870s.

the lightbulb

Edison did not invent the electric light. Humphry Davy demonstrated an arc lamp in 1802, and at least twenty inventors produced incandescent bulbs before him; Joseph Swan demonstrated one in Newcastle in 1878 and was granted a British patent, which is why Edison eventually had to merge with him as Ediswan. What Edison produced in October 1879 was a bulb that lasted long enough and cost little enough to sell, together with the generating and wiring system to make it useful.