Most of the intelligence out there must be artificial intelligence. We keep looking for critters like us living on a planet like ours, where in fact the majority of the intelligence out there is not biological. That would be my argument.

In archaeology, context is the basis of many discoveries that are imputed to the deliberate workings of intelligence. If I find a rock chipped in such a way as to give it a sharp edge, and the discovery is made in a cave, I am seduced into ascribing this to tool use by distant, fetid and furry ancestors.

Our brains are continuing to evolve, and perhaps a few tens of thousands of years from now, our descendants will walk around with five pound brains, allowing them insights that we can't imagine.

While it may be disappointing, I have to confess to people who ask for my insights on the meaning of it all that astronomy doesn't provide any clearly useful data on matters of sin and souls.

Going meatless reduces our carbon footprint and helps us lead the way towards climate change.

No one does a better, cleaner, or environmental friendlier, than the United States, when it comes to drilling for oil, gas, coal, oil refineries and fish friendly hydroelectric.

The ocean is our planet's life support system, yet in my travels and at home, I've seen its degradation firsthand.

You always bump into politics in life, and as a man, I'm party to a number of environmental issues that concern me first and foremost, as a man, as a father.