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TIL the Vikings had their own version of rap battling called "flyting" which is "a ritual, poetic exchange of insults practised mainly between the 5th and 16th centuries"

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RvV8 TIL that s5 0014+81, the biggest suppermassive black hole known, is so bright due to it’s huge event horizon that if it were 100 light years away from Earth (6.31 billion times more distant than the Sun), it would appear just as bright as our host star.
1aBMD TIL in the 18th century, the wealthy would keep live "garden hermits" or, people that would dress as druids and live in handmade grottos among the properties. They would be used as entertainment, could not cut their hair or nails, and were often treated as sages.
Xk1k TIL that when studying sea anemones off the coast of Yemen, researchers discovered that there’s no natural enemy for the Yemeni anemone.
mLpY TIL of Iqbal Masih (1983-1995), a Pakistani child who, at age four, was sold into bondage by his family, escaped after years of hardship and helped thousands of children flee bondage labor through his internatioal activism. He was assasinated at age 12.
wLelJ TIL that Rob Riggle (the actor that plays Captain Jack in The Office 'Booze Cruise') is actually a Retired U.S. Marine Corps Lieutenant Colonel. He retired in 2013 after 23 years of service.