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TIL about the "Theremin", a musical instrument that you play without physically touching it. By moving your hands closer or away from two metal antennas, you alter the theremin's surrounding electromagnetic fields and the interference causes an audible sound.

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XKe8 TIL that neither of the two most prominent sects of Judaism at the time of Jesus believed in Heaven. The Pharisees believed in reincarnation, and the Sadducees didn’t believe in any afterlife at all.
RY0j TIL that on August 11, 1984, Ronald Reagan joked about attacking the Soviet Union, not realizing that he was being recorded. He said “"My fellow Americans, I’m pleased to tell you today that I’ve signed legislation that will outlaw Russia forever. We begin bombing in five minutes.”
b644Q TIL that according to the Cleveland Clinic if you want to remember the correct rate of compressions while performing CPR on an unconscious person, you can follow the beats of songs such as Bee Gees' "Stayin' Alive" or "Hips Don't Lie" by Shakira - i.e. 100 to 120 times per minute.
VMvMD TIL that during the Lewis & Clark expedition Sacagawea was reunited with her brother Cameahwait, the "Great Chief" of the Lemhi Shoshones. This led to generous aid including selling horses, carrying cargo, sharing knowledge of the Bitterroot Mountains and the Columbia River, and supplying a guide.
QJAre TIL that Lt. Pham Quang Khiem managed to escape South Vietnam in April 1975 with 53 relatives and friends by stealing a C-130a and flying to Singapore. They were later flown to Guam and then the US, where Pham became a pilot for US Airways. The C-130a is currently at the National Warplane Museum.