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TIL the Lord Howe Island stick insect, once thought extinct due to rats from a shipwreck, was rediscovered in 2001 and successfully bred in captivity, saving the species from extinction.

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VB7y4 TIL about a tiny titanium pump weighing only 11 grams that can handle a blood flow of 1.5 liters a minute is smallest artificial heart.It was invented by an American, Doctor Robert Jarvik and used initially on animals. An artificial heart for adults weighs 900 grams.
W79L4 TIL that on May 1, 2014, the stock exchange was fined $4.5 million by the Securities and Exchange Commission to settle charges that it had violated market rules
KgV4 TIL Gold can be created in a laboratory, but it is dangerously radioactive.
KYRpG TIL that a family of ducks came into the lane of rower Bobby Pearce in the 1928 Amsterdam Olympics, and he let them pass and stopped rowing, but still won by nearly 30 seconds. He was undefeated in single sculls for the next 20 years.
rRoxy TIL co-writer of "Take Me Home, Country Roads," Bill Danoff, had never been to West Virginia and actually considered using Massachusetts in the lyrics instead. He also later went on to write and record the 1976 #1 hit "Afternoon Delight."