The article doesn't contain explanations, so I dug into a few especially surprising ones: --- > 7. Months have either 28, 29, 30, or 31 days. Great Britain s

The article doesn't contain explanations, so I dug into a few especially surprising ones: --- > 7. Months have either 28, 29, 30, or 31 days. Great Britain skipped from Sept 2, 1752 straight to Sept 14 when they switched from the Julian to the Gregorian calendar. Google "English calendar riots". --- > 15. Unix time is the number of seconds since Jan 1st 1970. When flipping over to the next second, Unix time "rewinds" back a second (i.e. repeats the last one) for leap seconds. [1] --- > 73. Time passes at the same speed on top of a mountain and at the bottom of a valley. This is from "time dilation", related to Einstein's General Relativity. In short, gravity warps spacetime. Say you use a stopwatch to measure 1 Earth rotation (a "day"). For each extra km of altitude, the stopwatch will tell you it took ~10 extra nanoseconds to complete the trip around the Earth. [2] --- [1] https://en.wikipedia.org/wiki/Unix_time#Leap_seconds https://en.wikipedia.org/wiki/Unix_time#Leap_seconds [2] https://en.wikipedia.org/wiki/Time_dilation#Time_dilation_caused_by_gravity_or_acceleration https://en.wikipedia.org/wiki/Time_dilation#Time_dilation_ca...