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TIL that daily or weekly streak doesn’t motivate people to continue doing something once it’s discontinued. Rather, it’s better to show the total number of days that you did something since the number will never be decreased and never demotivate users.

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BrkGk TIL that in 1997, Julie Rea Harper scuffled with a man in her home who had broken in and killed her son. She was initially tried and convicted of the murder, but after a later apprehension, serial killer Tommy Lynn Sells admitted to Harper's account and his guilt, resulting in Harper's exoneration.
epeA6 TIL Los del Río, the artist who performed "Macarena" were formed in 1962, the year before the Beatles released their first album
04p1 TIL that Bill Nye’s only marriage lasted only for seven weeks and that he actually had to get a restraining order against his ex after she poured weed killer in his garden
rRRLW TIL that the government of Brazil attempted to transform the country into a major manufacturer of computers in the 1980s. The import of foreign computers was banned so that people would have to use Brazilian models, which were of inferior quality since the government spent very little money on R&D.
noVG TIL there is such a thing as one-way bulletproof glass. This allows you to return fire through the glass while still keeping you protected from the attacker (your shot leaves a bullet-sized hole, but doesn’t compromise the rest of the shield).