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TIL of elder rights activist Maggie Kuhn who founded the activist group Gray Panthers. She advocated for intergenerational housing, opposed the Vietnam War, attempted to reduce the taboo surrounding the sexualities of older people, and believed teenagers should have more societal responsibility.

xV7Z1 TIL only 400 out of the 7000 diseases classified as “rare” have an effective treatment. This fact is recognized during Rare Disease Day, which is held every year on the last day of February. This day also holds an extra special meaning on February 29 – the rarest day of the year.
QO5a TIL keeping your teeth and gums healthy helps to prevent heart disease, strokes, and dementia.
N76wP TIL that Heat Lightning isn’t an actual type of lightning. It’s the reflection of lightning on clouds from a thunderstorm so distant (and obscured by hills, mountains, curvature of the Earth, etc.) that we can no longer hear the accompanying sound.
N7bPM TIL in 1959 a white man from Texas disguised himself as a black man and traveled for six weeks on greyhound buses. After publishing his experiences with racism he was forced to move to Mexico for several years due to death threats.
6O0l TIL of hockey player Clint Malarchuck who, in 1989 nearly died after his carotid artery and jugular vein were both sliced open in a freak hockey accident. Then 19 years later in 2008, Malarchuck attempted suicide by shooting himself with a rifle. He survived and now gives speeches about OCD.