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TIL American captives in the Vietnam war would authenticate a new prisoner’s American identity by tapping the first five notes of “Shave and a Haircut”, against a cell wall, and waiting for the appropriate response

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O7WR TIL that Rob Thomas initially recorded the song “Smooth” as a demo for Santana, who, after hearing it, decided that Thomas should record the final version. The song went on to be ranked second most successful song of all time by Billboard in 2013.
GYg6g TIL That not only do dogs have a sense of time, but they can also distinguish certain days of the week from others
R7KYa TIL elephants (and other animals) can suffer from PTSD.
8aeGb Mars, the red planet, may not have always been so red. In fact, 3.5 billion years ago it had an ocean that spanned its entire northern hemisphere!
x6KA5 TIL Obesity in young adult Americans rose from 33% to 41% from 2009 to 2020