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TIL Mr. Potato Head was the first toy to be marketed on television, and it broke new ground with ads that specifically targeted the children who used the toy, rather than the parents who paid for it.

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8Nna TIL that when a massive power outage struck southern California in the 1990s, Los Angeles residents called 911 to express alarm about strange clouds hovering overhead; they were seeing the Milky Way for the first time due to the lack of light pollution.
VMwv0 TIL you are not supposed to take your dogs on an escalator as it can cause them serious injury
D5Zg TIL, in 1957, 92 percent of children were toilet-trained by the age of 18 months, studies found. Today the figure for 2-year-olds is just 4 percent. Only 60 percent of children have achieved mastery of the toilet by 36 months, and 2 percent remain untrained at the age of 4 years.
8eBWa TIL there are 352 million discovered knots
Q0Oa TIL in 2010, a school board gave Macbooks to students, secretly spied on them, and punished them later at school.