Exercise invigorates the body and sharpens the mind.

Right now, scientists are in exactly the same position as Renaissance painters, commissioned to make the portrait the patron wants done, And if they are smart, they'll make sure their work subtly flatters the patron. Not overtly. Subtly.

And entertainment has nothing to do with reality. Entertainment is antithetical to reality.

Let's be clear. The planet is not in jeopardy. We are in jeopardy. We haven't got the power to destroy the planet - or to save it. But we might have the power to save ourselves.

No one escapes from life alive.

The notion that the natural world obeys its own rules and doesn't give a damn about your expectations comes as a massive shock. But the natural world is not so malleable. On the contrary, it will demand that you adapt to it - and if you don't, you die.

You think you can destroy the planet? What intoxicating vanity. . . . . We've been residents here for the blink of an eye. If we're gone tomorrow, the earth will not miss us.