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TIL that the word “quisling”, or a person who collaborates with an enemy occupying force, is derived from a man named Vidkun Quisling, who headed a domestic Nazi collaborationist regime in Norway during the Second World War. His name is now synonymous with the word “traitor”.

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ANG67 TIL that a “Jiffy” is a real unit of time. Defined by Gilbert Lewis in 1926 as the time it takes light to travel 1cm (~33.3564 picoseconds), it has since been redefined in astrophysics & quantum physics by Edward Harrison as the time it takes for light to travel 1 fermi (or, 10^-15m: ~3×10^-24sec):
7rwJx TIL Animals are increasingly shifting from day to night to avoid people. Even activities like hiking and camping can scare animals, causing them to become more active at night.
6E5yY TIL that Dogs’ facial expressions are not just random face movements. These facial expressions are actually tools to communicate with their owners. According to the study, the researchers inched toward the conclusion that dogs are smiling at us.
x6o8w TIL the length of the US rail network is twice that of Europe
rWed TIL Antarctica has 24 different time zones. The scientists who reside there go by either the time of their home land or the supply line that brings them food and equipment.