state a random obscure fact thread

Humans and dolphins are the only species that have sex for pleasure.
 
The Florida panhandle was twice its current size 12,000 years ago.
 
And, a revolving doormat was invented in 1935:

Today in TIME Tech History: Revolving Doormat (1935), Stratospheric Balloon Ride (1946), ?Videodisc? Players (1980) and More | TIME.com

Another inventor observed that people wiping their feet on doormats all wipe with a rearward motion, which gradually flattens the bristles and decreases the efficacy of the mat. Some callers are too lazy to wipe their feet at all. Both problems are taken care of by his revolving doormat which gives the feet a circular scouring while the visitor stands still.
 

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