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TIL roller coasters use three sets of wheels to keep the trains on the track. Running wheels which are on top of the rails, side friction wheels which are on the side of the rails, and up-stop wheels which are under the rails. This is why inversions and negative-g moments are possible.

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WOpB TIL that Martin Luther King Jr’s assassin, James Earl Ray was once erroneously honoured during a parade which intended to praise the actor James Earl Jones. Lauderdale, Florida accidentally created a plaque in January 2002 which read ‘Thanks James Earl Ray for keeping the dream alive’.
KOd96 TIL a child, Bobby Dunbar, disappeared at age 4, then was "found" in another state with different parents. Investigators took the child, returning him to the Dunbars. Years later, DNA revealed it was the wrong kid.
Br4QK TIL that during the filming of Poltergeist (1982), the clown doll nearly really killed Robbie Freeling due to an animatronic error when the clown's arm constricted too tightly around his neck. When the actor started protesting he couldn't breath, Spielberg thought he was improve acting.
1a9md TIL of the Latin phrase "Damnatio memoriae" meaning "condemnation of memory", indicating that a person is to be excluded from official accounts, including the destruction of depictions, the removal of names from inscriptions and documents, and even large-scale rewritings of history.
xVD1k TIL of the Octopus Stinkhorn. The fungus erupts from the egg by forming into four to seven elongated slender arms. The arms unfold to reveal a pinkish-red interior covered with a dark-olive spore-containing gleba. In maturity it smells like putrid flesh.