Psoriasis is a condition where an overactive immune system causes discomfort and discoloration of the skin. Learn what we know (and don't know!) about how psoriasis works in this episode of BrainStuff.

BrainStuff Classics: How Did Alchemy Create Chemistry?
07:11

How Did Sundown Towns Say the Quiet Part Out Loud?
11:35

Why Do We Yawn, and Why Is It Catching?
12:02