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TIL today is National Cheese Pizza Day

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O5g4 TIL, When passing sound waves through an air bubble immersed in water, it presents a rather unusual occurrence; light.
GvQ7 TIL that no one knows who invented the fire hydrant, because its patent was burned in a fire.
1aWlP TIL Admiral Karl Dönitz would contact U-boats under his command up to 70 times a day to ask them about their position, fuel levels, and other minutiae. This frequent contact between Dönitz & his U-boats helped the Allies to break German ciphers
wNZo TIL that the first aerial refueling occurred when Wesley May climbed from a Lincoln Standard to a Curtiss Jenny with a 5 gallon can strapped to his back in 1921.
XELdr TIL, potential new antibiotics were discovered due to research into folklore that putting Russian brown frogs into a milk bucket would keep the milk from going sour.