Carl Sagan,
author, scientist and popularizer of Science in general.
Carl's biggest book was Cosmos. He appeared in the companion PBS series by the same name. In it, he would navigate the often complex world of Science with a sure hand and explanation.
In one episode, he compared humans with trees and pointed out their similarities and differences!
Carl didnot believe in a diety and he also wanted to believe in 'little green men.'
