Turning cream into a stick of butter involves some complex chemistry, crystallization, and (traditionally) fermentation. Learn more -- plus the difference between sweet cream, cultured, and European butters -- in today's episode of BrainStuff.

Why Are Brown Recluse Spiders Not All That Scary?
11:13

BrainStuff Classics: When Has a Single Vote Decided an Election?
07:50

How Do You Grow a 3,000-Pound Pumpkin?
11:56