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TIL a questionnaire was sent to 800 migraine patients and 200 cluster headache patients about their experience with sexual activity during a headache attack. The researchers found that sexual activity lead to partial or complete relief of headache in about 30% of the patients.

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E1yAo TIL One of the reasons a full circle is 'decided' to be 360 degrees (and not a more obvious number, such as 100) because 360 is divisible by 24 different numbers, which makes it easy for math calculations. In contrast, 100 is only divisible by 9 different numbers.
XEPd8 TIL Post-traumatic stress disorder (PTSD) more than doubles a veteran's risk of death from any cause and is an independent risk factor for cardiovascular disease. PTSD is more than a psychological disorder.
R7da9 TIL that during the cold war, the Soviets fired a machine gun in space. It was a defensive weapon on a secret space-spy-lab and was fired remotely after all personnel departed. The results have not been released.
kJLrm TIL the second atomic bomb was intended for Kokura, but poor visibility from cloud cover and smoke forced the crew to circle the city three times. Low on fuel, they abandoned the mission and proceeded to Nagasaki, where the bomb was ultimately dropped.
0wvwL TIL that when a young Julius Caesar was kidnapped by pirates, he demanded they more than double the amount of money they were ransoming him for. He also 'joked' that after his release, he'd come back and crucify them, something he then did after his release