Award-winning science writer Sam Kean dives deep into the origins of our atmosphere for his latest book, Caesar's Last Breath: Decoding the Secrets of the Air Around Us. Kean looks at what makes up the air as well as how humans have used those elements in industry and art. 

Sam Kean will appear in conversation with Robert Krulwich at the Strand (828 Broadway, at 12th St.) on July 19 at 7 p.m.