This influential, yet controversial idea requires that the mixture of species on Earth at any moment acts as a collective organism that continuously (yet unwittingly) tunes Earth's atmospheric composition and climate to promote the presence of life... But I'd bet there are some dead Martians and Venusians who advanced the same theory about their own planets a billion years ago.

You say you're worried about kids? I'm not worried about kids, I'm worried about grown ups... Children are not the problem here... We spend the first year of their lives teaching them how to walk and talk, and the rest of their lives telling them to shut up and sit down.

Everything we do understand about the universe - the periodic table of elements, Einstein's laws, Newton's laws, all of chemistry, all of biology - that's 4 percent of the universe. We got to the moon on the 4 percent we do understand. We landed on Mars on the 4 percent we do understand. So the day we crack the nut of the rest of that 95 percent... Oh my gosh.

Curiously, light-loving green plants reject the Sun's green light, reflecting it back at you, which is why they look green.

Next time you're stunned by a large moon on the horizon, bend over and view it between your legs. The effect goes away entirely.

When NASA makes discoveries they are profound and they make headlines, everyone takes notice. It drives dialogue and, today, it would drive the blogosphere. It would drive the projects the kids do in school. So you wouldn't even need programs to try and stimulate curiosity. You wouldn't need programs to try to convince people that science literacy is good. Because they're going to want to participate on this epic adventure that we call space exploration.

Einstein's theory, we know that it fails. In advance, we know it fails. So that a deeper understanding of nature is awaiting us.