You start with difference, with mystery. Some things spiral, some become spheres, some branch, some don't. We know that inert atoms quicken, become bees, goats, clouds, then dissolve back into randomness. We look at these things, all these very, very different things, and we wonder, are they really different, or is every thing we see one thing, expressed differently? Does the universe have rules? How many? Could there be a single generating principle, a oneness?
What are you afraid of? The TED Radio Hour is asking that question this week. Guy Raz spoke to retired astronaut Chris Hadfield, who commanded the International Space Station, about the scariest day of his life.
GUY RAZ, BYLINE: Can you describe the day of a launch? Like, what happens on that day?
CHRIS HADFIELD: It's like a - that feeling in a roller coaster, I think, where you get into that little chunka, chunka, chunka chain thing that drags you up the hill to make the ride begin.