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TIL 9% of school-aged children are diagnosed with ADHD and medicated in the US, compared with 0.5% in France. The discrepancy comes from differences in treatment. France found that changing social context, not prescribing drugs, mitigated the behavioural problems in the majority of cases.

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JY0d4 TIL Many Japanese swords can be traced back to one of five "Gokaden" or "The Five Traditions" which were traditional schools of sword smithing. Each is named for the historical regions of Japan where they originated. As time went on, different schools merged techniques to forge more unique swords.
D1ELg TIL about the Bolton Strid, a narrow section of river in Yorkshire, England that appears shallow and calm, but is actually a deep, powerful river flowing vertically. Local legend claims none who have entered its waters have survived.
epKQ6 TIL that in 1959, Claude Shannon, a mathematician from MIT demonstrated that machines can learn by experience using a mechanical mouse that can remember the previous paths that led to an artificial cheese in a maze.
pRRQ TIL blacks and Hispanics make up BOTH 96% of victims and suspects of shootings in New York City (Page 11 of 16 in the report) and 85%+ of all crime suspects according to the NYPD [PDF]
N7KV1 TIL that during the manhattan project, there was a legitimate concern that upon the detonation of an atomic bomb, the atmosphere would ignite and turn the earth into a mini star, killing everybody.