You read a bunch of books and you get a bunch of how-tos, and you take a bunch of classes and you learn a bunch of techniques. You set yourself goals and benchmarks. I think people have imported that into their experience of taking care of children.

Because we imagine, we can have invention and technology. It's actually play, not necessity, that is the mother of invention.

Young children seem to be learning who to share this toy with and figure out how it works, while adolescents seem to be exploring some very deep and profound questions: how should this society work? How should relationships among people work? The exploration is: who am I, what am I doing?

Texts and e-mails travel no faster than phone calls and telegrams, and their content isn't necessarily richer or poorer.

If you just got enough expertise and enough special techniques and read up enough, then you could shape a child into the kind of adult you wanted. There's almost this kind of competitive enterprise. That picture is the picture I think people often imply when they use the word "parenting".

All of us gardeners know that nothing comes out the way you planned. It's a different garden every year, and it's always sort of different from what you were thinking when you began. What it really means to be a good gardener is to work hard to produce an ecosystem that will have enough diversity, enough possibilities, so it's robust, and it's resilient, and it can change when the seasons change. And that kind of robust, unexpected, variable, messy system - that's what you want to create when you're having children, too.

Scientists learn about the world in three ways: They analyze statistical patterns in the data, they do experiments, and they learn from the data and ideas of other scientists. The recent studies show that children also learn in these ways.