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TIL the U.S. Navy employed a dolphin, Tuffy, to regularly deliver tools and mail to scientists living in an experimental underwater laboratory.

Read more navalhistory.org

via reddit.com

9wQdB TIL about Aleksandr Karelin, a wrestler with a record of 887 wins and 2 losses, who also went undefeated for 13 years.
Meyo0 TIL: An infidelity study conducted between 2010-2016 determined women only cheat more than men at age 18-29. The biggest cheating age is 60-69. Blacks had a 22% rate, Hispanics were at 13% with Whites in between. It was determined having both parents reduced the chances of infidelity.
XE7QE TIL: Finland has ten trees for every person in the world
neNaP TIL horses can communicate with humans by pointing to symbols. Researchers trained the horses to understand 3 symbols which meant “blanket on,” “blanket off,” and “no change.” After training they were tested in different weather conditions and researchers found the choices matched the weather.
pYAWQ TIL that during WW2, for over a year, the British and the Germans had independently discovered how to jam each others' radar. But they decided not to use it, for fear of giving the tactic away to the other side.