Bicycling is a big part of the future. It has to be. There's something wrong with a society that drives a car to work out in a gym.

Researchers have proven that scientifically, that all humans are one people

As my old professor Carl Sagan said so often, 'When you’re in love, you want to tell the world.’ And I base my beliefs on the information and the process that we call science. It fills me with joy to make discoveries every day of things I’ve never seen before. It fills me with joy to know that we can pursue these answers. It is an astonishing thing that we are — you and I are one of the ways the universe knows itself.

I like to regard myself as someone who's capable of critical thought, that is to say, who can evaluate claims.

Climate change is a real deal. So, hey deniers - cut it out, and let's get to work.

Science is the best thing humans beings have ever come up with. And if it isn't, science will fix it.

I say to the grown-ups, 'If you want to deny evolution and live in your world that's completely inconsistent with everything we've observed in the universe that's fine. But don't make your kids do it.'