I have quoted, commented on, reviewed, and in other ways engaged with Carl Sagan here on the blog in the past. Today I’m sharing a recent comment of mine on Facebook in response to someone who had been pushing back against his classic axiom “extraordinary claims require extraordinary evidence.” He said it more than once, but this time it was in a meme in the context of a larger quote from his 1980s TV series Encyclopedia Galactica: “What counts is... Read more