The cloaca is the hole-y grail to understanding prehistoric copulation.
Don’t go mooning the sun just yet.
Anal sacs can tell you a lot about an animal.
Our editors scrounged up some truly bizarre facts.
Like deadlifts, squats exercise way more than the obvious bits.
Anal glands have never been so interesting.
Kepler's Twitter discovers a new moon
You'll never guess what lab this research came from.
Plus, the best colored monkey butts on the internet!
Meet Ged Galvin, the Steve Austin of colorectal surgery. After a car crash in which Galvin almost died, surgeons at...
Like science, tech, and DIY projects?
Sign up to receive Popular Science's emails and get the highlights.