As a kid， I spent my summers with my grandparents on their ranch in Texas. I helped fix windmills， vaccinate cattle， and do other chores. We also watched soap operas every afternoon， especially "Days of our Lives." My grandparents belonged to a Caravan Club， a group of Airstream trailer owners who travel together around the U.S. and Canada. And every few summers， we'd join the caravan. We'd hitch up the Airstream trailer to my grandfather's car， and off we'd go， in a line with 300 other Airstream adventurers. I loved and worshipped my grandparents and I really looked forward to these trips. On one particular trip， I was about 10 years old. I was rolling around in the big bench seat in the back of the car. My grandfather was driving. And my grandmother had the passenger seat. She smoked throughout these trips， and I hated the smell.

"We are all apprentices in a craft where no one ever becomes a master."

The human brain consists of many specialized circuits that evolved to solve specific problems our ancestors faced during our evolutionary history.

The future of energy is diverse—no single source will dominate.

The teacher should not teach as if he were pouring knowledge into an empty vessel, but rather as if he were lighting a fire.

The history of mathematics is a history of human curiosity and ingenuity.

The development of efficient algorithms is as much an art as it is a science.