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TIL that during the Cold War, the US military developed a “supergun” capable of firing projectiles into space to intercept enemy satellites

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LkBxQ TIL the original wording of the phrase "Blood is thicker than water" was exactly that. The popular "Blood of the covenant" variant is a modern invention whose origin can be traced to two authors.
80rG TIL Mordechai Vanunu, a nuclear technician in Israel and anti WMD activist leaked a photograph to the British press of evidence Israel had nuclear weapons. He was later tracked by Mossad, drugged, bound, thrown in a bag and renditioned to Israel for trial.
NXm6e TIL globular clusters were thought to be stars until the 1700s, proved the Sun is far from the Milky Way’s center, and are among the oldest objects in the universe, yet have unclear origins.
KOeO9 TIL that, since 1945, the only artists who could have - at one point - claimed to have the biggest selling album of all time were Vaughn Meader (The First Family), Carole King (Tapestry) and the BeeGees (Saturday Night Fever), before Michael Jackson released Thriller in 1984.
yY4w TIL that if Louisiana was its own country, it would have the highest incarceration rate in the world.