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TIL the Syndrome of the Third Man. An unseen presence that converses with the victim and offers encouragement and practical advice has been seen by mountain climbers and explorers during stressful survival circumstances.

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NXQ9e TIL the sodium vapor process (aka yellowscreen) was extensively used by Disney as an alternative to the better-known bluescreen, to composite actors and background footage with less side effects on human skin tones. It featured in Mary Poppins (1964), and Dick Tracy (1990) marked its last known use.
Z8MKQ TIL One Clydesdale horse can pull 8,000 lbs but two in tandem can pull 24,000 lbs.
ADp7 TIL that, using Wolfram Alpha, you can see your Facebook’s Account stats like most used words, top commenters, etc.
NXdkb TIL Caesar Salad originated in the 1920s from Tijuana, Mexico!
Jy81 TIL a volcanologist died at an observation camp when Mount St. Helens exploded in 1980. He had agreed, for one day, to fill in for a colleague who was rotating out a third scientist based at the camp. The man rotated out died 11 years later during the Mount Unzen (Japan) eruption.