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TIL humans have an arc in the foot as a need to bear more weight due to bipedalism, apes on the other hand have flat feet.

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WknYN TIL During WW II the US Army was aware that mail to soldiers was critical for morale, but overwhelmed with the volume and space it took to ship. So the resuscitated a British/Eastman Kodak method where every letter was photographed, and the film was shipped, then printed. It was called V Mail.
Bg4GW TIL performance-enhancing drugs like Adderall and Ritalin are prevalent in esports, boosting focus and reaction time but risking addiction and health issues. Leagues like ESL penalize PED use, while others lack regulation. Many players also rely on energy drinks, raising similar health concerns.
4XN1R TIL RPG doesn't actually stand for "Rocket Propelled Grenade", but rather "ruchnoy protivotankovy granatomyot". Which means "hand-held anti-tank grenade launcher".
45Xa TIL Milk must be offered at every meal if a United States school district wishes to get reimbursement from the federal government.
DXRJ TIL that married women drink more than their unmarried counterparts, whereas the opposite is true for men, according to a 2012 study.