''Great people won't come back anymore''

From the 700s to the 1200s, Baghdad was an Intellectual Center unrivaled in the world. It's House of Wisdom studied mathematics, astronomy, medicine, alchemy and chemistry, zoology, and geography.

The Doomsday Seed Vault on Svalbard has over 21,500 cannabis seeds in it. That means that there are more seeds in there for weed than there are for aspargus, blueberry and raspberry, for example.