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TIL: The first item/invention to break the sound barrier was the whip. The cracking is a sonic boom.

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9QrM TIL: A man tried to rob a bank after paying $500 to a wizard to make him invisible. Thinking no one could see him, he strolled into a bank in Tehran and started snatching money out of people’s hands
b9MlQ TIL that clonally transmissible cancers exist. These cancers can be transmitted between individuals without the involvement of an infectious agent (unlike e.g. HPV-associated cervical cancer). They are very rare in humans but more common in dogs, Tasmanian devils and clams.
X0eDE TIL that roughly 90% of normal matter exists in the "empty" space between galaxies, with the remaining 10% existing in galaxies, stars, planets, etc.
7rl8P TIL The Gyrojet was a family of firearms that fired tiny rockets called Microjets. In theory the rockets accelerate over a distance making them non-fatal at close range and fatal at greater distances.
wL1XJ TIL of the CSI Effect. Due to popular TV shows exaggerating the capabilities and techniques of forensic science in criminal investigations, many jurors have begun to demand a greater amount of evidence from the prosecution during trials, raising the standard of proof needed for a conviction.