Blood types are a 20-million-year mystery

Overview

Do you know what your blood type is? It’s a pretty basic health question with a pretty bizarre history. We take a look at some ill-fated blood experiments from yesteryear, and try to figure out why it is that all blood isn’t alike. And, our intrepid video director Cory Zapatka takes the question into his own hands with a blood typing kit and a needle...