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Experts tell us that 90% of all brain development occurs by the age of five. If we don't begin thinking about education in the early years, our children are at risk of falling behind by the time they start Kindergarten.

The defects of the mind, like those of the face, grow worse with age.

The human brain is a product of natural selection. In the face of scarcity, our hominid great-great-uncles were unable to compete against our sapient great-great-grandparents' abilities to build more elaborate mental models and orchestrate their bodies' movements in more sophisticated ways.

When you meet chimps you meet individual personalities. When a baby chimp looks at you it's just like a human baby. We have a responsibility to them.

Babies have millions of brain cells. They are like light bulbs waiting to be turned on. Don't wait for them to go to school and hope for the best.

Truly, learning appears to be a reverse geometric progression with experiences at one hour, one day, one month or one year dramatically more influential and formative than later experiences. As has often been quoted, 85% of brain development takes place by age 3, and yet we spend only 4% of our educational dollars by that point.

Putting babies as young as two weeks into child care for the first year of their life, for 60 hours a week, will cause their brains damage.

Why do we have a brain in the first place? Not to write books, articles, or plays; not to do science or play music. Brains develop because they are an expedient way of managing life in a body.

Men and women are different. I don't think men grow a brain until 26 or even 30. Girls mature a lot quicker.

If a brain is exercised properly, anyone can grow intelligence, at any age, and potentially by a lot. Or you can just let your brain idle - and watch it slowly, inexorably, go to seed like a sedentary body.