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TIL China's single child policy resulted in groups of people that had never encountered genetic siblings. The notion of "sibling" was a hard one for the children to grasp - a task made more difficult by the Chinese tendency to use the term for "brother" or "sister" when talking about cousins

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V98Q TIL that the killer of Jacob Wetterling, an 11-year-old boy who was kidnapped in 1989 and went missing for 26 years, was actually questioned by the FBI less than two months after the boy’s abduction, but was let go. In 2016, he confessed to the killing – but he will not be charged.
16JPX TIL about Robert Williams - His death, although an industrial accident, is considered to be the first known instance of a human to be killed by a robot.
0wwkR TIL after years of inbreeding by kennel clubs, modern bulldogs' noses are so squashed they can barely breathe, their heads are so big they almost always have to be born via C-section. Their tails can become ingrown, they all have hip dysplasia, and their average life expectancy is 6 years.
v1gJj TIL of spray paint on sidewalks called “utility graffiti,” which uses colors and symbols to identify pipes and wires underground. Marking the ground wasn’t standard until 1976, when a dig in Los Angeles punctured a gas line and created a “wall of fire” that killed 9 people and destroyed 7 buildings.
8eBjL TIL Great White Sharks have poison resistance that defies logic. Samples of shark blood showed levels of arsenic and mercury that should be harmful if not deadly but the sharks were unaffected. Additionally Great Whites' have impressive self-healing abilities.