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.

The adverse economic events following the First World War turned me toward economics.

In war, everything changes. You are very selective of what you do because everything you do can be the last thing you do in your life.

Among all the upheavals of war with al Qaeda, the surest indicator of the historic stakes is the ongoing rotation of top U.S. government managers - scores at a time - into a bunker deep underground and far from Washington.

The Book of Revelation is the strangest book in the Bible, and the most controversial. Instead of stories and moral teaching, it offers only visions - dreams and nightmares, the Four Horsemen of the Apocalypse, earthquakes, plagues and war.