A common way to compute density is, of course, to take the ratio of an object's mass to its volume. But other types of densities exist, such as the resistance of somebody's brain to the imparting of common sense.

Some of the greatest poetry is revealing to the reader the beauty in something that was so simple you had taken it for granted.

Scientific inquiry shouldn't stop just because a reasonable explanation has apparently been found.

I simply go with what works. And what works is the healthy skepticism embodied in the scientific method. Believe me, if the Bible had ever been shown to be a rich source of scientific answers and enlightenment, we would be mining it daily for cosmic discovery.

I know that the molecules in my body are traceable to phenomena in the cosmos. That makes me want to grab people on the street and say: ‘Have you HEARD THIS?

This past year, we received our second Emmy nomination for Outstanding Informational Series. While we'd all like to win, I can say with utmost sincerity that it mattered more to me that we got noticed than whether or not we win.

The press still thinks [global warming] is controversial. So they find the 1% of the scientists and put them up as if they're 50% of the research results. You in the public would have no idea that this is basically a done deal and that we're on to other problems, because the journalists are trying to give it a 50/50 story. It's not a 50/50 story. It's not. Period.