physicsbuzz.physicscentral.com

Lk8G0 TIL in 1990 the Lockheed SR-71 Blackbird set a speed record when it travelled from LA to Washington DC in a bit over an hour, with an average speed of 2,144 mph.
D1rEV TIL that Southern live oak was a secret weapon of the USS Constitution, one of America's first naval vessels, that was nicknamed "Old Ironsides" after so many cannonballs bounced off her hull because live oak wood is a super dense wood.
p8K8G TIL that for insects the size of fruit flies, the air density for them is like water density to us.