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Some concern is beneficial but obsessing is often futile.

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R7rn9 TIL The chocolate layers between the wafer layers in a Kit-Kat bar is made of crushed up Kit-Kat bars that didn't make it past quality control.
JY1LQ TIL that Ricky Gutierrez set the Major League Baseball record for seeing the most pitches in a single at-bat (20) in 1998 against a pitcher, Bartolo Colon, who nearly 20 years later is still an active player.
M9b8 TIL that while attending Harvard in 1959, the “Unibomber” Ted Kaczynksi participated in a study where he was subjected to a “purposely brutalizing psychological experiment,” which some lawyers attribute some of his future emotional instability and dislike of mind control.
J1JO1 Today I learned there's a tree with bark that curls off and scientists aren't sure why this happens
vPElL TIL that The Postal Service's Give Up album involved long-distance collaboration via mailing CD-Rs. However, they did not use the actual USPS — FedEx and UPS were the chosen couriers.