Talk of the Nation
<iframe src="http://www.npr.org/player/embed/93636630/93636618" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
New research indicates chili pepper plants may have developed their signature heat as a way to fight off fungal infections caused by insects.
Joshua Tewksbury, assistant professor of biology at the University of Washington
NPR thanks our sponsors
Become an NPR sponsor