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TIL in the early 1950’s many elementary students in Lake County Indiana and Utah were tattooed with their blood type incase nuclear war broke out.

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WkoVd TIL of "Better Days" by Natalia Gutierrez Y Angelo, a 2010 Colombian song with a secret hidden message in Morse code meant for the soldiers kidnapped by the FARC (Colombian guerilla). The message was "19 people rescued. You are next. Don’t lose hope."
RQ8w TIL that JFK would not let Sammy Davis play in the White house in 1961 after his interracial marriage Illegal in 31 states at the time. His marriage not only made headlines, it inspired death threats and demonstrations and forced Davis to hire 24-hour armed guards.
GXr7 TIL that the $100 billion tobacco industry in Indonesia is virtually unregulated. With grade school aged children as a prime target, it is common for males to start smoking as early as age 6. Tobacco smoke is also used as a holistic treatment for diseases and cancers of the body.
PY8nJ TIL Dane Cook has Laugh Factory's endurance record of performing for 7 hours straight, beating previous record held by Dave Chappelle by 38 minutes.
yQJke TIL Financial crisises correlate with Solar activity cycles