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TIL the ancient city of Hieropolis in modern Turkey was thought to be the location of a Gate to Hell by the Romans. This was likely due to toxic levels of CO2 from gas vents that killed animals with noses close to the ground. The vents are bricked up today for tourists' safety.

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jOaQ TIL In 1928 two AF officers flew to a record of 38,000 feet in a small biplane. The controls then completely froze in the -78 degree air, and with oxygen depleting, they waited for 20 minutes until the plane ran out of fuel. Now powerless, the pilot glided all the way down for a smooth landing
pYAd8 TIL that the James Webb Telescope orbits a Lagrange point, a spot in space where the gravity from earth and sun (or another set of bodies) cancel one another out and satellites can orbit the spot rather than earth, giving a unique perspective.
N1eJ TIL that the treadmill was invented as a form of punishment for prisoners
V9Gm TIL that heavy metal can induce positive emotions for those that are feeling angry.
Jkrm TIL Roger Federer is a father of two sets of identical twins. Twin girls born in 2009, and twin boys in 2014.