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TIL the monument in front of the tomb of Wu Zetian, China's only female monarch, has no inscriptions. Among the many explanations given: she saw her great achievements as indescribable; she didn't want the scholars to smear her name; or as a Buddhist, she considered life and death to be meaningless

WBA9 TIL during the 1936 Olympics in Berlin, 25,000 pigeons were released during the opening ceremony. When a cannon was fired, the pigeons begun to poop on the spectators watching the ceremony below.
9wOMD TIL There is a kind of kite that work underwater, call tidal kites. In fact it is high-tech tidal turbines, generating electricity from the power of the ocean.
R7o1w TIL how you can tell if two screenwriters wrote the screenplay together or rather rewrote each others. If it says "x&y" it means they wrote it together. However if it's "x and y" it means that they rewrote each others material.
VMdX4 TIL killer whales use a hunting technique known as a "karate chop" against sharks. Using its tail it pushes the shark to the surface on a vortex, then raises its tail high in the air and slams it on the shark’s head. Then it flips the shark over causing tonic immobility, rendering it paralyzed.
WkXl8 TIL about the elephant bird that went extinct around 1000 -1200 BCE. The birds were so large they could reach the weight of 1,600 pounds and grow as tall as 9.8 feet. There eggs had a circumference of 35 inches. They once lived on Madagascar and the closest living relative is the Kiwi.