Where did language come from? Is it possible to know without traveling back in time? And how do babies learn to speak? Plus: We’ll hear how the word “silly” has evolved over the last several hundred years.

More sport science: bats and black eyes
25:25

Sport science: softballs, baseballs, and curve balls
27:12

Is there such a thing as a blue raspberry? And why are raspberries hairy?
26:32