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TIL since sound can travel through water better than it can air, the potential number of decibels is greatly increased. LFA Sonar used by ships and submarines is the loudest man made noise, reaching 200+ decibels. Marine biologists believe that sea creatures may beach themselves to escape the noise.

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8eJvX TIL At age 19, future President Lyndon Johnson secured a job teaching elementary school to impoverished Mexican-American students in 1928. Within three months, Lyndon developed various programs including contests in spelling and public speaking, coaching sports
PYb6g TIL Nashville Zoo is located on property that was once a 300-acre slave holding farm. When construction for the zoo began in 1997, this graveyard was not disturbed. It was only in 2013 did the zoo petition to have the bodies exhumed, revealing 9 to 30 African-Americans buried there
dvk7 TIL That while filming the movie “The Descent,” the scene in which the creatures first came into contact with the protagonists was the first time the actresses had ever seen the monsters. They had no idea what was coming, and their’ screams of terror were real.
G9Bj TIL The SR-71 Blackbird, the fastest plane ever built, would go so fast its outside temperature would reach 572 F (300C). It had to be built with components that could grow as they heated. Because of this, the jet would leak fuel until it got hot.
a8DKb TIL Exposure to neighborhood violence has also been found to prospectively predict high levels of peer-rated aggression for children living in impoverished communities