When you lock eyes with your secret crush, or have to go to an interview for a life-changing job opportunity, you start to feel that strange, fluttering sensation in your stomach: butterflies. Why does that happen?

THIS IS COOL. I WANT TO LEARN SOMETHING ELSE, TOO!

Video via – SciShow
Further Readings And References @ MSDManuals, Nat Geo News, PLOS One, and NCBI

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