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TIL In Japan, there is a belief that your blood type determines your personality and compatibility similar to Zodiac sign or Astrology.

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xNNo TIL that Washington, D.C. uses a series of acoustic sensors called “ShotSpotter” to detect gunfire. When “ShotSpotter” sensors detect a loud noise, a central computer program analyzes the acoustic signature, pinpoints the suspected location to within a few yards and notifies police.
exl5 TIL Aphex Twin encoded a secret picture of a grinning face into a song on his 1999 ‘Windowlicker’ EP
GY1WJ TIL Ed Sheeran’s childhood friend was struggling financially and asked him to put one of her songs on his then-nearly completed album “X”. Instead they wrote “Thinking Out Loud” together which was released as a single and hit #1. She’ll never have to worry about money again.
6ELmY TIL That beyond the 3 states of matter; solid, liquid and gas, there is a 4th state called plasma which is an aggregate of charged ions. Not only does it occur naturally in lightning and on the surface of the Sun it can also be produced in the laboratory.
DQ0vP TIL that when Charles Guiteau bought the gun he would use to assassinate President Garfield, he chose one with a more expensive ivory handle, thinking it would look better in a museum. Though the gun was given to the Smithsonian, it has since been lost.