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TIL that in 1869, physicist Ludvig Lorenz developed an equation for the relationship between the refractive index of a medium and it's density. In 1878, unrelated physicist Hendrick Lorentz independantly discovered the same equation. The result is called the Lorentz–Lorenz equation.

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0dWXy TIL of Gunnar Sønsteby, a member of the Norwegian resistance in WW2, whose Oslo Gang stole the printing plates for the kroner from the Central Bank and assassinated the Nazi head of police for Norway. He was the most highly decorated Norwegian citizen at the time of his death.
wVJM TIL a woman purchased and renovated a Boeing 727 (airplane) to live in and ended up costing only about $30,000
jNw9M TIL George Lucas approved of Mel Brooks’ Star Wars parody Spaceballs and signed off on a fair use agreement. The only condition was that no Spaceballs merchandise would be made to compete with Star Wars merchandise. This is why there’s never been any Spaceballs figures, cereal, or flamethrower.
P1O5E TIL about penitentes, spikes of snow that typically form in high-altitude areas. They can get as tall as 20 feet in the right conditions and are known to be very hard to break.
e05LL TIL 85% of our old clothes end up in a landfill, equating to about 25 billion tons of textile waste annually in North America that contaminate the water and soil because most of the clothing fibers cannot biodegrade.