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TIL that the screeching noise you get from scraping your fingernails against a chalkboard is uncomfortable because it is similar to a primate warning call and triggers a fight or flight response.

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4RkX TIL astronomers used a large sample of galaxies to average out the color of the universe. The result: Beige.
6P4w TIL the inventor of PGP (Pretty Good Privacy) was arrested in the US for violation of arms-export laws. His crime: he came up with good cryptography for communications and made it available worldwide, which was considered aiding the enemy with munition.
Q4Mk TIL The world’s tallest man ever, Robert Wadlow (8ft 11 inches), was placed in a concrete vault after he died becasue his family feared someone would steal his blood
7rgZx TIL that several months before Russell Crowe won the Oscar for Gladiator, the FBI warned him that the al-Qaeda were planning to kidnap him as part of a “cultural destabilization plot”. For nearly two years, the FBI guarded Crowe in public and refused to give him any details about the threat.
4X4YR TIL In almost every country the world over, Jews have faced religious persecution but India is one of the few countries where Jews were never ill-treated.In 1948, after the formation of the state of Israel, 33000 Jews migrated to Israel leaving behind around 5000 Jews in India.