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TIL two nearly identical men with the same name were the reason that fingerprinting was invented

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BM7W TIL it is the 105th anniversary of the Tunguska Event - the largest “impact event” on or near Earth in recorded history, and had scientists confused for many years.
4kBva TIL that caste classifications were used by colonial officials in India to formulate land tax rates, as well as to frequently target some social groups as "criminal" castes and castes prone to "rebellion"
yQRvV TIL the 1904 St Louis Olympics was almost entirely an American event. Due to the cost, time and difficulty of travelling to St Louis, 523 of the 630 total athletes were US Citizens.
VmAZ TIL Pearl Jam’s song “Jeremy” is based on a true story where a high school student committed suicide in front of his class.
ppGN TIL: One of the first signs of a blood type mismatch in a transfusion is ‘a feeling of impending doom.’