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TIL that crows can learn to make and use tools by observing other crows, or even just by seeing a tool.

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6EayY TIL that historically, polio was not widely fatal. 72% of all infections were asymptomatic; 24% resulted in mild illness; 1-5% resulted in more serious but short-term symptoms. But polio was still feared, due to the <1% of cases that led to permanent paralysis and death in a further 5-30% of them.
9Yo5D TIL the Feynman Lectures on Physics, freely accessible online, is widely appreciated to be one of the most well written summaries of physics, and fully grapsing its brilliantly intuitive explanations allows one to enjoy a true understanding of the concepts
YpgXZ TIL that in 1987 when David Bowie performed “Heroes” near the Reichstag in West Berlin, a massive crowd gathered on the eastern side to hear him perform from over the wall. The performance is considered to be a catalyst to the fall of the Berlin Wall.
wLGZY TIL that Rob Gronkowski never spent any of his NFL salary money and lived strictly off of endorsements
MbBV TIL Bullying, child abuse, and stress causes children to age faster at a cellular level and leads to physical and mental health problems even decades later, including an earlier death.