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TIL that the word 'nerd' was first coined by Dr. Seuss in his book 'If I Ran the Zoo'.

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wLARY TIL why the sky is blue. White light (which is made up of all the colors) comes from the sun, and hits our atmosphere, which breaks it apart. Blue light has a higher frequency than most other colors, so it scatters much faster, filling our skies.
78RWL TIL that Pizzly Bears are the offspring of a female Polar Bear and a male Brown Bear. These hyprid Bears are able to breed offspring and to date there have been 8 confirmed hybrids (4 50:50 B:P, 4 75:25 B/P) in the wild. All 4 75:25 came from one 50:50 female and all 4 50:50 came from one female PB.
RG61 TIL of the Battle for Castle Itter where defected Wehrmacht soldiers requested the help of American soldiers to help defend the castle from the Waffen-SS, who planned to execute the French VIP’s inside. It is the only known battle in World War II where the German and American armies fought together.
ADAY7 TIL the world's foremost expert on ants chose to study ants because when he begun his entomology career in 1947, insect pins were hard to come by due to WWII metal shortages. Unlike other insects, ants are stored in vials, not pinned.
ZpZva TIL of Operation Matador, a British plan to make a preemptive attack on the Japanese Empire in WWII. It was halted on December 6, 1941 - the Japanese bombed Pearl Harbor the following morning.