It’s that time of year again… the time when chemistry lovers everywhere celebrate the mole, aka Avogadro’s number:

6.022 x 10^23

which is the number of atoms in 12 grams of carbon-12.

How big is that? Here’s a great little video from TED-ed to explain:

“How big is a mole? (Not the animal, the other one.)” – Daniel Dulek