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TIL that clapperboards are used to synchronize audio and video captured in separate devices

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GYgP4 TIL that when teens are taught that people have the potential to change their socially relevant traits over time, they tend to cope better with social stress, and end up earning better grades in school.
5vgn TIL that in 1990, a British Airways pilot was sucked half way out of the planes window for over 20 minutes. He was only kept in by a crew member holding onto his belt. He survived with frostbite and a broken arm.
grA87 TIL that after being killed during John Brown's raid on Harpers Ferry, the body of Brown's son Watson was severely mutilated and put on display in a nearby medical college by pro-slavery secessionists. Union soldiers burned the college to the ground in 1862.
mxWQE TIL of Sir Alexander Cuming, a Scottish nobleman who traveled to the southeast US based off a dream of his wife. He became chief of the Cherokee Nation, defrauded several colonists, and attempted to turn South Carolina into a new Jewish homeland. He later became an alchemist and died in a poorhouse
XEgO8 TIL Russia's Kamchatka Peninsula has the highest concentration of active (29) volcanos on Earth. Separated by only 180 kilometers (110 miles), 4 of them, Shiveluch, Bezymianny, Tolbachik, and Kizimen were all erupting simultaneously on January 11, 2013.