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TIL that there is a specific bark of a male cheetah that causes females to ovulate.

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5V9jP TIL scientists calculated that a week-long nuclear war involving about 100 nuclear weapons would kill 27 million people directly and 255 million people from starvation, while a week-long war involving 4,400 nuclear weapons would kill 360 million people directly and 5 billion people from starvation.
PY7gO TIL I learned that the first vibrator was invented in the late 1860's by Dr. George Taylor. It was used to cure symptoms of depression and anxiety, symptoms for a female condition that was commonly referred to at the time as "hysteria."
EOM0 TIL that the entire alphebet and numbers 0-9 can be found on the wings of different types of butterflies
RrO7 TIL that during WWI, at one point skirmishing Russian and German forces had to declare a temporary truce to fight off a sudden onslaught of wolves that were making regular raids on trenches. The joint operation was successful.
Me1Em TIL Norway has a sovereign wealth fund to the value of over $1 Trillion USD which includes 1.3% of global stocks and shares, it is primarily funded by the profits of the Norwegian petroleum sector. In total the fund has a value of over $180,000 per Norwegian resident.