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TIL that a titanium hammer harnesses 97% of the energy from a hammer swing to the nail, whereas a steel hammer only transfers 70% of the energy.

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ZE4Y TIL of Betteridge’s law of headlines which states: “Any headline that ends in a question mark can be answered by the word no.”
xkjb TIL in ancient China, an enemy held the Emperor’s father hostage, threatening to boil him alive … his response was “Send me a cup of the soup.”
p6OA TIL that ‘saddam hussein’ is a golf term meaning to go from bunker to bunker
yQbre TIL about Belphegor's Prime. It's the palindromic prime number 1000000000000066600000000000001. Named after Belphegor, Prince of Hell, it has 666 at its heart surrounded by 13 zeros on either side
GYeK5 TIL that the music video of the song "The Reason" by Hoobastank, is actually supposed to simulate the band members robbing a store. The car crash shown at the start is a diversion.