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TIL that the science of bite-mark comparisons, ballistic comparisons, fingerprint matching, blood-spatter analysis, arson investigation and other common forensic techniques have been tainted by systematic error, cognitive bias (tunnel vision) and little or no research or data to support it.

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XEw4Q TIL Prior to allying with the Soviet Union, Fidel Castro was a political celebrity in the US, celebrated as a liberator and modern day Robin Hood.
yQ68v TIL about "Pele's tears" and "Pele's hair" which are named after the Hawaiian fire goddess of volcanoes, Pele. Pele's tears are small pieces of solidified lava drops, whereas Pele's hair is thin strands of volcanic glass. Pele's tears are often found on one end of a strand of Pele's hair.
D1kep TIL about the Hmong people's exogamous wedding customs . Before he may "zij" (snatch) her, the boy must first give a gift to the girl. After which, the boy may then zij the girl. If the boy never presented a gift, she is allowed to refuse and return home with any family member who comes to save her.
xv6w TIL that Bradbury wrote the entire novel “Fahrenheit 451” in the basement of UCLA’s Powell Library on a pay typewriter that he rented for a fee of ten cents per half an hour. It took him only 9,80$ and 9days.
5gyB TIL Ray Bradbury wrote a short story where a time traveling safari hunter accidentally crushes a butterfly under his boot in the Cretaceous period, thereby changing the course of history millions of years later. He wrote the story two decades before the term “Butterfly Effect” first came into use.