I can’t think of any more human activity than conducting science experiments. Think about it — what do kids do? … They’re turning over rocks, they’re plucking petals off a rose — they’re exploring their environment through experimentation. That’s what we do as human beings, and we do that more thoroughly and better than any other species on Earth that we have yet encountered… We explore our environment more than we are compelled to utter poetry when we’re toddlers — we start doing that later. Before that happens, every child is a scientist. And so when I think of science, I think of a truly human activity — something fundamental to our DNA, something that drives curiosity.