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TIL about the symbiotic relationship of wolves and ravens. Ravens will lead wolves to prey so that they can take a portion of the leftovers.

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wJBW TIL that the North American grey squirrel is an invasive species in Europe. After the Italian government formed a well planned eradication strategy (where the outbreak started), PETA stepped in and collapsed the program near its finish. Now the grey squirrel has spread to the rest of the continent.
x6pNk TIL about the Bussard Ramjet, a theoretical method of spacecraft propulsion for interstellar travel. A spacecraft scoops up hydrogen from the interstellar medium, the hydrogen is compressed until thermonuclear fusion occurs, and the fusion provides thrust for the spacecraft.
9YeGm TIL National Masturbation Day, also known as International Masturbation Day, is an annual event to protect and celebrate the right to masturbate. The first National Masturbation Day was celebrated on May 7, 1995 in US.
YpaPZ TIL after being thrown from his horse, jockey Ralph Neves was pronounced dead, brought to the morgue, injected with adrenaline to the heart, jumped up, returned to the racetrack, and demanded to be allowed to ride the rest of his mounts that day.
7rK4O TIL the grammatical rule against ending a sentence with a proposition was first stated by John Dryden, recommended Shakespeare's works be rewritten to remove style impurities.