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TIL when you experience excitement, your thoughts trigger the pituitary gland to tell the adrenal glands to release adrenaline. This pulls blood to your lungs and muscles (to activate your fight-or-flight response) and away from your stomach. Boom! There are your butterflies.

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0Pgj TIL early in American football, one coach had football-shaped leather patches sewn onto his team’s jerseys creating the illusion of a field full of ball carriers. When this trick was tried against Harvard, they countered by painting all the balls crimson, making them invisible against their jerseys
XEBbr TIL of the Sea Peoples. They were a group of raiders and pirates that nearly toppled ancient Egypt, conquering almost half the country. Archaeologists do not know anything about where they came from or who they went afterwards.
yENJ TIL from watching NatGeo and talking to my ex-Air Force grandfather that Area-51 was created and operated primarily for the eventual construction of the SR-71 Blackbird, and that aliens and UFO’s were just the workers trolling people who asked questions.
9dom TIL Nanoparticles containing bee venom toxin melittin can destroy human immunodeficiency virus (HIV) while at the same time leaving surrounding cells unharmed.
4k6yN TIL that during Star Trek filming, censors required actresses not to show their navels. Gene Roddenberry was so irked by this that he made the villains in his 1973 TV movie "Genesis II" identifiable by each having two navels, thus filming each navel he’d previously been forced to censor twice over.