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0daD1 TIL that every year an estimated 4.5 trillion cigarette butts are littered worldwide, making them the most littered item on the planet.
LQ16P TIL Dr. William Halstead, who is considered the father of modern surgery due to his research in multiple surgical fields such as antisepsis to prevent infection, developed addictions to both cocaine and morphine during his career, due to experimenting with the drugs' numbing abilities on himself
Mel87 TIL that the most mass a planet can have is ~10-13x the mass of Jupiter. After this point, it's own sheer gravity begins to cause nuclear fusion and the body is classified as a brown dwarf (also called a failed star).