Because - Chemistry!
One of my college buddies is now a doctoral candidate in theoretical chemistry at UC Irvine. He's also a rock god, so much so that I affectionately call him the "heavy metal chemist". Anyway, he and his UCI Dept of Chemistry colleagues have recently released a video parody of a certain song from a recent Disney film. It's hysterical. Have a look, tell your friends, and enjoy! Because, as the song says, "#ChemistsKnow"!