Mental Floss

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Penguins mate with a "cloacal kiss."

From critter-killing copulation to beautiful “bladder songs,” here are some of the strangest facts about sex in the animal kingdom.

Jon Mayer, Bethel Afful








DEET might not exist without military research.

From bug spray to Epipens, you might be surprised to learn just how many items taking up shelf space in your home were originally developed for the front lines.

Jon Mayer




The Hollywood sign turns 100 in 2023.

When developers put up a larger-than-life advertisement for their new L.A. housing development in 1923, they had no idea it would become one of the most iconic landmarks of all time.

Stacy Conradt