The stirrings of morality emerge early in childhood. Toddlers spontaneously offer toys and help to others and try to comfort people they see in distress.

Nature is a hanging judge," goes an old saying. Many tragedies come from our physical and cognitive makeup. Our bodies are extraordinarily improbable arrangements of matter, with many ways for things to go wrong and only a few ways for things to go right. We are certain to die, and smart enough to know it. Our minds are adapted to a world that no longer exists, prone to misunderstandings correctable only by arduous education, and condemned to perplexity about the deepest questions we can ascertain.

You wouldn't believe the kind of hate mail I get about my work on irregular verbs.

But in most cases even the possibility that the correlations reflect shared genes is taboo.

Jews are known for many things, but strength, swiftness, and agility are not among them. There is one trait, as controversial as it is familiar, for which Jews are above all known, and that is shrewdness in business.

Anything that makes it easier to imagine trading places with someone else increases your moral consideration for that other person.

Of course genes can’t pull the levers of our behavior directly. But they affect the wiring and workings of the brain, and the brain is the seat of our drives, temperaments and patterns of thought. Each of us is dealt a unique hand of tastes and aptitudes, like curiosity, ambition, empathy, a thirst for novelty or for security, a comfort level with the social or the mechanical or the abstract. Some opportunities we come across click with our constitutions and set us along a path in life.