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TIL in Tennessee it is unlawful for any male person to willfully refuse to aid a policeman in making a lawful arrest when such a person's assistance is requested by the policeman and is reasonably necessary to effect the arrest.

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KYXQG TIL modern day heart and lung transplants were heralded by a scientist who once surgically added a second head to a dogs body. The dog lived for almost a month.
DvDg TIL some elite Vikings carried “Ulfberht” swords. The steel used to make Ulfberht swords, was superior to European blackmithing for 800yrs.
Zedo TIL that Elmer Fudd, the hunter from Looney Tunes, is a vegetarian, and just hunts for the sport of it
nePxd TIL the mens' Olympic Javelin was modified in 1986 to reduce throwing distances. The longest throws were beginning to exceed the length of the field and were a danger to people in the stands. The new javelins only fly 90% as far as the previous design and all pre-1986 records have been nullified.
LkggP TIL The honeyguide bird is the only known animal that will, untrained and uncoerced, lead humans to honeycombs that would be otherwise difficult for a human to locate without their help. This teamwork benefits the human and honeyguide bird by making finding and eating the honeycomb easier.