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TIL catnip is safe for dogs, calms them down (opposite effect of cats), and provides many health benefits to them.

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QJ7Gd TIL during the US Civil War, Union Lt. Custer (of later Little Big Horn fame) found a West Point classmate Capt. Lea who was fighting for the Confederates and was captured. While recuperating, Lea met and married his nurse. Custer attended the wedding in full blue Union uniform, with Lea in gray.
E1Vnp TIL Navy Captain Chris Cassidy studied mathematics at the Naval Academy, ocean engineering at MIT, was a Navy SEAL for 11 years, and is an astronaut who spent 181 days in space.
VM4e4 TIL that there are 3 trillion trees on Earth, which is more trees than there are stars in the Milky Way galaxy and cells in the human brain.
woEp7 TIL there are an estimated 2 BILLION parking spots in America
d8vEj TIL that the decibel (dB) scale is logarithmic instead of linear. The difference between a rock band and an airplane taking off is only about 10dB.