On this edition of Conversations, Bret Stetka talks with host Dan Skinner about “A History of the Human Brain – From the Sea Sponge to CRISPR - How Our Brain Evolved.” Stetka is a non-practicing physician, and a freelance health and science journalist for a variety of print and online publications. He’s a regular contributor to NPR as well as “Scientific American Magazine,” where he writes about neuroscience, psychiatry, and evolution.