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.

What If Earth Had Rings?
12:46

Why Do We Blush When We're Embarrassed?
10:23

BrainStuff Classics: How Are Ethnicity and Race Different?
09:41