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TIL some Australian Leeches live exclusively on land, also having Two jaws

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E9Dw TIL color laser printers print a watermark on every page that identifies the printer to ease government fears of forgery.
RnZ8 TIL a lonely, defomed dolphin was adopted by a family of sperm whales.
gMaB7 TIL in an effort to demonstrate time dilation, a father and his kids drove three atomic clocks up Mt. Rainier. The measured effect was just over 20 nanoseconds, matching Einstein's theory of relativity.
Z8gVv TIL about garum, a popular condiment in ancient Rome. Garum was a type of fish sauce that was widely used in everyday cooking, came in different flavors, and even had a kosher version.
GYnPJ TIL that there is a Peruvian Christmas Tradition where people fight each other to settle grievances on Christmas Day.