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TIL the HBO series Rome featured one of the largest sets ever constructed for a television show, at over 5 acres, and was also one of the most expensive, at over $100,000,000US.

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0wOBL TIL about Memory of Mankind, a sophisticated time capsule project in Austria designed to last a million years. The designers made a system for the capsule to be discovered by a future society and even planned for the possibility of it being discovered by alien life.
X00b6 TIL the best way to orient your fan to get fresh air is to have it push air out the window
W4rB TIL when a city in Indiana replaced all their signaled intersections with roundabouts, construction costs dropped $125,000, gas savings reached 24k gallons/year per roundabout, injury accidents dropped 80%, and total accidents dropped 40%.
94W7 TIL in 1996 a plane carrying 163 passengers was hijacked, the pilot, Leul Abate, who had been in two previous hijackings, made the only true water landing of a widebody airliner with survivors, whilst the first officer, Yonas Mekuria, was fighting with the hijackers. Also, the landing is on tape.
j6ePN TIL The Outer Space Treaty and COSPAR require that space exploration does not expose the earth to extraterrestrial contaminations. Additionally extraterrestrials cannot be exposed to contaminants from earth, so spacecrafts and lander have to be sterilized before going to other planets.