We do nothing for children between the ages of zero and five. And we seem to be quite happy to have children growing up in not just poverty, which wouldn't be so bad, but isolation, lack of people around them, lack of support, lack of ability to go out and play in the dirt.

In most places and times in human history, babies have had not just one person but lots of people around who were really paying attention to them around, dedicated to them, cared to them, were related to them. I think the big shift in our culture is the isolation in which many children are growing up.

I've had three of my own children and spent my professional life thinking about children. And yet I still find my relation to my children deeply puzzling.

Overall, female scientists have fewer resources than male scientists, just as poor people have less access to health care. But if you compare male and female scientists with identical resources, you find that the women are just as likely to be successful.

The Internet's impact is immense. My students can't imagine ever paying for a book.

The Internet makes it possible for people like me to live the way I do now. Without it, I'd have to be in New York or some other city. I think the Internet is the greatest invention in history after antibiotics.

What's interesting about the shift from an industrial age to a technological age is that we keep inventing new media: movies, records, radio, television, the Internet, and now ebooks - and one of the things that's most interesting about the invention of a new medium is watching it reinvent itself as it penetrates the culture.

I don't care where you are in the world, people are aware of what technology is available to others. If you're in Nairobi, you're certainly aware of the iPhone.