Spice Girls

Spice Girls

(alt-text)

The Earth's five major mass extinctions were the Posh Extinction, the Sporty Extinction, the Scary Extinction, the Ginger Extinction, and the Baby Extinction.

What If? is now on YouTube!
Check out the first video for the answer to
“What if we aimed the Hubble Telescope at Earth?”
and follow xkcd’s What If? The Video Series channel to be notified about each new video.