Scientific American FrontiersSurgical Slimmers. In spite of the risks, people are lining up to solve their weight problems in the operating room. And if the latest device - an implantable stomach pacer - works out, millions more will be taking the surgical way out.

Cars that Think. The fully automatic car may be down the road a ways, but cars that do your thinking for you are just around the corner - they watch out for hazards, they listen to you, they read your lips, they even know when you're distracted.

Going Deep. A look back at the decades of effort that culminated in the deep sub Alvin reaching the ocean floor, and a look forward to what's next now Alvin's retiring.

Chimp Minds. A visit with an engaging if unruly bunch of cousins that we formally broke up with about 6 or 7 million years ago - with whom we share almost all of our genes but not a lot of our lifestyle. Why the difference? Maybe it's in how we learn.

Hot Planet - Cold Comfort. So you think global warming won't affect you? Wait until the great Atlantic Conveyor shuts down. And find out what's already happening in Alaska.

Hydrogen Hopes. Hydrogen may be the fuel of the future, but what will it take to safely and efficiently make the transition from today’s fossil fuels?

Hidden Motives. If you think you know why you do things, you're probably wrong. How does the unconscious mind determine human behavior?

The Secret Canyon. The best kept secret of American archeology is now revealed – an entire canyon of perfectly preserved 1,000-year-old remains.

Cybersenses. Replacement synthetic senses for people are now a reality. Children as young as 12 months are already getting artificial hearing - while the first trials of electronic retinas for the blind are just beginning.

Robot Pals. To be really useful, robots need to behave as cooperative partners rather than mindless machines. We'll meet three robots - including a future member of an astronaut team - that are trying to better understand us.

Watch the full documentary now (playlist - 4 hours, 23 minutes)