Carl Sagan
Videos
Carl Edward Sagan was an American astronomer, planetary scientist and science communicator. Initially an assistant professor at Harvard, Sagan later moved to Cornell, where he was the David Duncan Pro
Sagan in 1980
Sagan (age 16) in the 1951 Rahway High School yearbook
Sagan in the University of Chicago's 1954 yearbook
Sagan and the Viking spacecraft
Lynn Margulis
Videos
Lynn Margulis was an American evolutionary biologist, who was the primary modern proponent for the significance of symbiosis in evolution. In particular, Margulis transformed and fundamentally framed
Carl Sagan
…1979. In 1980, he cofounded the Planetary Society. Sagan wrote the Encyclopædia Britannica entry on Life, later updated by his first wife, the biologist Lynn Margulis. Sagan's first popular science book was The Cosmic Connection. He introduced the Cosmic Calendar in The Dragons of Eden, which won the 1978 Pulitzer…
Margulis in 2005
The chloroplasts of glaucophytes like this Glaucocystis have a peptidoglycan layer, evidence of their endosymbiotic origin from cyanobacteria.