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TIL Spray foam insulation can cause toxic air if its not mixed correctly or the temperature is too hot during curing

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rPPx TIL that anyone who removes Hawaiian rocks from the islands is said to be cursed. Every year people mail back thousands of pounds of rock, sand, and shells to Hawaii Volcanoes National Park, many with reports of how their lives were ruined by the curse.
oRZ8 TIL In 2010, The Texas Board of Education removed founding father, Thomas Jefferson, from the state social studies curriculum because of his beliefs in deism and replaced him with the religious right icon John Calvin.
PYexn TIL The US may have adopted the metric system if pirates hadn’t kidnapped the French scientist sent to help Thomas Jefferson persuade Congress to adopt the system
GAnW4 TIL Finger-fumbler in sign language is the equivalent of a tongue-twister.
l7En7 TIL that the fastest recorded tennis serve was by Australian player Samuel Groth, at 263.4 km/h (163.7 mph) in 2012.