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TIL Flying "coach" is a reference to traveling by stagecoach, which involved large numbers of travelers sharing cramped quarters with little to no amenities. This primitive, negative connotation is why airlines don't officially call it "coach," but rather "economy class."

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4koNa TIL The United States spent $20.2 billion a YEAR on air conditioning in Iraq and Afghanistan.
PAoE TIL that male survivors of Ebola Virus Disease can harbor active virus in their sperm, and transmit the disease sexually months after their own recovery.
8e0RK TIL about Herman Davis, a World War I soldier renowned for his extraordinary marksmanship. With just his Springfield rifle and open sights, he took out five enemy soldiers from 1,000 yards away. He humbly described it as “just a good shootin' distance.”
ADoJl TIL Theodore Streleski was a Stanford Math PhD student who didn't get his PhD after 19 years of study, and then proceeded to murder his advisor.
EVPW TIL that the Tomb of the Unknown Soldier in Arlington National Cemetery, is empty. In 1998, the remains were identified as USAF 1st Lt. Michael Blassie, and were reinterred in St. Louis, MO - his hometown.