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TIL about the Epley maneuver, a simple and effective treatment for vertigo which involves a sequence of head movements. Doctor John Epley had a hard time convincing other doctors that it was effective despite the ease of application and proven efficacy.

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XYer TIL that Drano works by causing at least five chemical reactions that work together to heat up, dissolve hair, turn grease into soap, dissolve the soap, and ultimately clear the drain
j6bRv TIL about Matthias Knutzen, the first known person to call himself an atheist in modern history. Very little is known about his life and he disappeared from the public record in 1674. He openly rejected the idea of a higher power, soul, devil, and afterlife, opposing all political authority
7abr TIL that George W. Bush named The Very Hungry Caterpillar by Eric Carle as his favorite childhood book. It was published when he was 23 years old.
Oon0Y TIL in a study of 640 dream journals conducted by Harvard, psychologists determined the dreams of prisoners in WWII POW camps were less aggressive than the standard male population. Rather than visions of extreme violence, the majority of soldiers dreamed of escape, family, loneliness, and home.
xVNYb TIL... Of First and Second Sleep.In the early 1990s, psychiatrist Thomas Wehr conducted an experiment in which a group of people were plunged into darkness for 14 hours every day for a month.They slept first for four hours, then woke for one or two hours before falling into a second four-hour sleep.