New York City Citizen, Jake Hayes

A newly discovered fossil of a shark that dates back 300 d 25 million ers, shows a remarkably different gill skeleton than modern sharks. The new gill ystem may have changed overtime to help sharks a sprint after their prey, or pry open their jaws to eat larger things. You can hang out with us outside of the podcast on twitter at s y s k podcast. And as always, join us at our home on the web, stuff you should know dot com.