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TIL that the Accessible Pedestrian Signal sound that gets pedestrians' attention the most efficiently is a "rapid tick," which sounds like a machine gun.

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x6bbw TIL in 2016, a suicide bomber carrying explosives in his laptop boarded Daallo Airlines, with the intention of destroying the aircraft. Twenty minutes after takeoff, the bomb detonated, resulting in a hole in the plane and the ejection of the bomber from the aircraft. he was the only casualty.
e0Xwg TIL Venus is the only planet in the solar system that spins backwards.
gAvW TIL that three men from Yemen sued NASA for invading Mars. They claim that they “inherited the planet from our ancestors 3,000 years ago”.
gMpey TIL about triplets that were deliberately separated at birth by their adoption agency. After investigative journalist, Lawrence Wright, looked into the matter, it was revealed the triplets were part of a scientific experiment by Dr. Peter B. Neubauer.
4XrPa TIL that a material's melting point is the same as its freezing point. These are just different terms for the same thing, it just depends on whether energy is being removed from a substance (freezing) or if energy is being added to a substance (melting).