If it were only a few degrees, that would be serious, but we could adapt to it. But the danger is the warming process might be unstable and run away. We could end up like Venus, covered in clouds and with the surface temperature of 400 degrees. It could be too late if we wait until the bad effects of warming become obvious. We need action now to reduce emission of carbon dioxide.

Every man should marry. After all, happiness is not the only thing in life.

So Einstein was wrong when he said, "God does not play dice." Consideration of black holes suggests, not only that God does play dice, but that he sometimes confuses us by throwing them where they can't be seen.

Real science can be far stranger than science fiction and much more satisfying.

We explore because we are human and we want to know. I hope that Pluto will help us on that journey.

It matters if you don't just give up.

There is no way that we can predict the weather six months ahead beyond giving the seasonal average.