Chris Hsu for American Public Media

Science under the microscope (Prove It: Part 2)

Science is a powerful fact-finding tool -- but how does it work? In this second installment in our series "Prove It: How to find the facts," we look to the past for answers. We find out how a snake heart helped get rid of an old idea about blood and how failed experiments are just as important as successful ones (bye bye, luminiferous ether). And we'll hear from scientists working today about how curiosity is at the heart of science.

Plus: a mystery sound and our Moment of Um tackles this question: “Where do snails get their shells?”

Listen to the rest of the series:
Part one: A brief history of facts
Part two: Science under the microscope
Part three: The scoop on journalism
Part four: How to find the facts