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TIL that Sudoku Can Save Photographers from Copyright Theft

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xVdRk TIL the reason public trams died out in American cities is because they were forced to subsidize infrastructure for cars and allow them to use tram-lines as roads thereby slowing down all rail networks, making them uncompetitive.
mxN0P TIL - Most of the smoke billowing up from a space shuttle launch is not exhaust. It is water vapor from the pool of water under the shuttle designed to absorb the acoustic shock waves that could otherwise tear the shuttle apart.
Nyeb TIL Antimatter, at $62.5 trillion per gram, is the most expensive substance in the world.
X0o8R TIL Why paper cuts are so painful is b/c at a microscopic level, paper is actually quite rough. A knife makes a straight cut, but paper acts like a saw blade and does more damage to cells and nerve endings. Paper also leaves behind tiny fibres and chemical residues, irritating the wound even more.
gMwp4 TIL NASA uses the unit of milli-pirate-ninjas (around 40.55 mW) when referring to power of the Curiosity rover components