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10

TIL El Salvador was ranked as one of the world's safest countries in 2023.

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W7oZL TIL The Clay Mathematic Foundation offers 1 million dollars to anyone to solve this equation. The Riemann Hypothesis. σ (n) ≤ Hn +ln (Hn)eHn
XxQD TIL that solid iron cannonballs kept underwater for a long time can explode once they reach the surface- [gas bubbles are trapped underwater at enormous pressure- once at surface, pressure is no longer equalized from within and without- ergo explosion potential]
RJg8 TIL that vampire bats will die if they can’t find blood for two nights in a row. Luckily, generous well-fed bats will often regurgitate blood to share with others, in exchange for grooming. This has been noted by many naturalists as an example of reciprocal altruism in nature.
p8oxp TIL the opposite of albinism is melanism and it is only present in animals but looks incredible.
5Bm9 TIL: The Raggedy-Ann doll, created is 1915, was used as a symbol for the anti-vaccination movement. TIL 2: There was an anti-vaccination movement in 1915.