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TIL about the Hessdalen lights: These are unexplained lights that have been observed in the Hessdalen valley in Norway since the 1940s. The lights appear as floating orbs and have been witnessed by thousands of people over the years.

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gMROX TIL because NATO's Article 6 covers only member states' islands in the North Atlantic north of the Tropic of Cancer, plus French Algeria. An attack on the U.S. state of Hawaii would not trigger the treaty, but an attack on the other 49 would.
Yp0yv TIL of Thales (620-546BC), who is considered to be the first philosopher because the lineage cannot be traced beyond him. His magnus opus: “All is water”
kJQ7g TIL that the ancient Egyptian pyramids weren't built by slaves as commonly portrayed. Instead, they were actually constructed by paid laborers and skilled artisans. These workers were also provided with good food, housing and the best medical care that was available at the time.
ZRrG TIL that in 1967 Vladimir Komarov became the first to die during a space mission. Reportedly he knew the mission would fail but went up anyway to save anyone else from dying. A final recording exists where he curses his commanders for ignoring his warnings as he burns up in re-entry
XNxE TIL a high school principal in Florida hypnotized dozens of anxious students and athletes to help them relax. When two of those students committed suicide and one died in a car accident, the principal was charged with two misdemeanors and lost his teaching license.