You are the reason why he exists on this earth. You don't have the right to abandon him just because he's inconvenient or has trouble in school.

And that's how things are. A day is like a whole life. You start out doing one thing, but end up doing something else, plan to run an errand, but never get there. . . . And at the end of your life, your whole existence has the same haphazard quality, too. Your whole life has the same shape as a single day.

You can't get decent Mexican food in DC.

Kids didn't have huge backpacks when I was their age. We didn't have backpacks at all. Now it seemed all the kids had them. You saw little second-graders bent over like sherpas, dragging themselves through the school doors under the weight of their packs. Some of the kids had their packs on rollers, hauling them like luggage at the airport. I didn't understand any of this. The world was becoming digital; everything was smaller and lighter. But kids at school lugged more weight than ever.

The past history of human belief is a cautionary tale. We have killed thousands of our fellow human beings because we believed they had signed a contract with the devil, and had become witches. We still kill more than a thousand people each year for witchcraft. In my view, there is only one hope for humankind to emerge from what Carl Sagan called "the demon-haunted world" of our past. That hope is science.

It's hard to decide who's truly brilliant; it's easier to see who's driven, which in the long run may be more important.

One may even suspect that there is more to reality than measurements will ever reveal.