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TIL: memory foam mattress get firmer in cold temperatures

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QyWk TIL that the Firefly TV show theme song “The Ballad Of Serenity” was used by STS-130 Space shuttle astronaut Robert L. Behnken and the other crew members as a wake up song on February 12, 2010
oRdK8 TIL the Mantis Shrimps' claws strike with the speed of a bullet, creating cavitation bubbles that generate light and heat nearly as hot as the sun's surface.
D1oWp TIL Pluto was named by 11-year-old Venetia Burney. After her grandfather read about the discovery, Venetia, who enjoyed mythology, said the planet was in a region similar to the dark, remote underworld ruled by the Roman god Pluto. Her grandfather then contacted astronomers suggesting the name.
1WxW TIL that there is a cave in Turkey that was believed to be the “Gates of Hell”. It was given the name because the cave contains toxic gases that, if inhaled could kill you in an “instant”.
V5m TIL there is a conspiracy theory that Egyptian treasures and tunnels were found in the Grand Canyon in 1909 and subsequently covered up by the Smithsonian. The area in question has numerous Egyptian landmark names and is currently off-limits to all hikers.