African elephants have long been thought of as a single species, but a critical mass of genetic studies now proves there are two.

I've seen a few wild grizzly bears, mostly in Alaska and British Columbia, and always from a distance. But each grizzly I've caught sight of was as fearsome and sublime as the last. You never get used to their raw power and massive bodies, or the mysterious intelligence in their dark, close-set eyes.

I have a king bed, one of those memory-foam mattresses that doesn't jiggle as you get in or out. Even if you cleaved it down the middle with a pickax, the thing wouldn't tremble. It's practically earthquake-proof.

If the dinosaurs are any indication, there's a place in our pantheon for the extinct. My son has a blue plushy allosaurus he calls Spot-Spot, with whom he often sleeps.

Grief is exhausting. When you learn - maybe through my age or experience - trying to harness the energy, whatever it is, muted energy or a concentration to find yourself in a place? You try to use it for when it's really necessary and can arrive.

I don't like travelling. Which is ridiculous. And it's not because I'm afraid of dying on the plane or anything. I just like to stay at home.

Contemplation of life after retirement and life after death can help you deal with contemporary challenges.

I don't have much of a wish list, but I'm dying to work with Erykah Badu. That's pretty much my dream collaboration.