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TIL 17 yr old future President Herbert Hoover showed great talent on the math entrance exam for Stanford but he never finished high school. He received remedial tutoring in August before he was accepted into the tuition-free university, and he vowed to help other students get a Stanford education

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D1xZe TIL: A survey of 12,000 parents with children aged from five to 12 years old, in 10 countries, found almost a third of children play outside for just 30 minutes or less a day. Conclusion: Children around the world spend less time outdoors than prisoners.
oBj5Y TIL helicopter rotor blades spin at a fairly constant speed and only gain lift by altering the angle of the blades. The centrifugal force is too much to attempt to alter the blade RPM enough to generate lift.
9YORG TIL of Bartholomäus Traubeck, an artist and engineer who discovered how to make music from tree rings. “A record player that plays slices of wood, [in which] year ring data is translated into music." The trees year rings are analyzed and this data is used to generate piano music.
Rnwj TIL that long nails of two NICU nurses (one with natural nails, one artificial) caused 46 pseudomonas infections in infants during a 15 month period. Sixteen babies died, at least 8 as a direct result of the infections.
Oo4Zg TIL in 1832, a US ship was captured by pirate Pedro Gilbert. After, he had part of filled with explosives, before setting it on fire with the crew trapped inside. However, they escaped and doused the flames, letting smoke billow out until the pirates had left. 6 weeks later, they returned to port.