If [Bush's] successors don't screw it up, within 10 years NASA will have us back to where we belong -- on other worlds.

Obama is a man of first-class intellect and first-class temperament. But his character remains highly suspect.

The Obama foreign policy, in broad strokes, has been a disaster.

The war is not going well and it is time to say why. It has been fought with half-measures. It has been fought with an eye on the wishes of our "coalition partners." It has been fought to assuage the Arab "street." It has been fought to satisfy the diplomats rather than the generals... Why have we not loosed the B-52s and the B-2s to carpet-bomb Taliban positions? And why are we giving the Taliban sanctuary in their cities? We could drop leaflets giving civilians 48 hours to evacuate, after which the cities become legitimate military targets.

Great leaders are willing to retire unloved and unpopular as the price for great exertion.

Every new president flatters himself that he, kinder and gentler, is beginning the world anew. Yet, when Barack Obama in his inaugural address reached out to Muslims by saying, 'To the Muslim world, we seek a new way forward, based on mutual interest and mutual respect,' his formulation was needlessly defensive and apologetic.

I don't think you can pump carbon dioxide into the atmosphere indefinitely and not have a reaction. But there are great scientists such as Freeman Dyson, one of the greatest physicists of the last hundred years, who has studied the question, who believes quite the opposite. The reason transnational action is so difficult is because the major problem with climate change is, A, that there is no consensus, and, B, that the economic cost is simply staggering. Reversing it completely might mean undoing the modern industrial economy.