How does a clock keep time?
A clock is a counter attached to something that repeats at a fixed rate — the entire history of timekeeping is the search for a more perfectly regular repeater.
Read the research →Why bread rises, how a clock keeps time, who decided a week has seven days. Each entry takes one question about something ordinary and answers it properly, with the history and the mechanism a reader can actually explain to someone else.
Food and drink · tools and machines · customs and calendars · the ordinary things with a long story
A clock is a counter attached to something that repeats at a fixed rate — the entire history of timekeeping is the search for a more perfectly regular repeater.
Read the research →Time zones were invented in stages between 1870 and 1884: American schoolteacher Charles F. Dowd proposed hourly zones for U.S. railroads in 1870, Canadian railway engineer Sandford Fleming proposed a worldwide 24-zone…
Read the research →Every entry here was one question, answered with its sources beside it. Yours can be the next one.