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NASA has successfully tested an advanced air-to-air photographic technology in flight, capturing the first-ever images of the interaction of shockwaves from two supersonic aircraft in flight.

Read more nasa.gov

9YjvQ TIL Akira Haraguchi, who in 2006 recited 100,000 digits of pi from memory at a public event near Tokyo. It took him 16hrs 30mins.
e0Y4b Today I learned that Lego creator, Ole Kirk Christiansen, created plastic interlocking bricks in 1949. They were originally named "Automatic Binding Bricks". Lego has kept their original size so all bricks can interlock.
7Pex TIL: Women who are pregnant cannot change a cats litter box because of the risk of Toxoplasmosis; NOT from the litter itself but from the cats urine.
m1kBv TIL the province of Guangdong in southern China has 126 million people in an area smaller than the state of Missouri.
rR6Oy TIL of Canada's "Apology Act" to allow habitually apologetic Canadians to say "sorry" without implying any admission of fault or liability.