Stefan Sagmeister: My all-time favorites

Dan Gilbert, author of "Stumbling on Happiness," challenges the idea that we'll be miserable if we don't get what we want. Our "psychological immune system" lets us feel truly happy even when things don't go as planned.

On the web, a new "Friend" may be just a click away, but true connection is harder to find and express. Ze Frank presents a medley of zany Internet toys that require deep participation — and reward it with something more nourishing. You're invited, if you promise you'll share.

Artist Theo Jansen demonstrates the amazingly lifelike kinetic sculptures he builds from plastic tubes and lemonade bottles. His creatures are designed to move — and even survive — on their own.

Paul MacCready — aircraft designer, environmentalist, and lifelong lover of flight — talks about his long career.

Benjamin Zander has two infectious passions: classical music, and helping us all realize our untapped love for it — and by extension, our untapped love for all new possibilities, new experiences, new connections.