When I was younger I was looking for this magic meaning of life. It's very simple now. Making the lives of others better, doing something of lasting value. That's the meaning of life, it's that simple.

I feel very strongly, we've got to give animals a good life. I've worked really hard improving slaughter plants and animal handling and transport. And people have said to me, why don't you work on improving conditions on pig farms? And basically, to be effective on making real change out there on the ground, you can only work on so many things. You know, you get too distributed, you're not effective.

The people that were socially awkward from my generation, they all had paper routes and that taught them the discipline of work.

I studied a lot of animal behavior and one of the things I find really interesting is the whole idea that animals are sensory based thinkers and I wrote about this in my book, Animals in Translation. That an animal's memory is not in words, they've got to be in pictures - it's very detailed so let's say the animal gets afraid of something - they'll get afraid of something that they're looking at or hearing, the moment the bad thing happens.

These diagnostic profiles like depression, ADHD, autism, dyslexia, it's half science and the other half is a committee of doctors bickering over what it should be, and it has changed. It's not precise like a diagnosis of tuberculosis would be very precise.

Half of Silicon Valley's got a little bit of autism.

A cat you train with clicker training and what you've got to do is pair the click with a food reward. And he's doing the stuff because you get a food reward. Once you can do it all after a lot training with no food reward.