Friction at the atomic level, the acoustics of historical speeches, and a news roundup

Alexei Bylinskii discusses friction at the atomic level and Braxton Boren talks about the acoustics of historical spaces, and David Grimm discusses daily news stories with Sarah Crespi. Hosted by Susanne Bard. [Img: Pericles' Funeral Oration by Philipp von Foltz, 1852] Learn more about your ad choices. Visit megaphone.fm/adchoices