Special features of this DVD: widescreen presentation ; materials and activities for educators ; Nova ScienceNOW web link ; Dolby Digital ; scene selection.

Executive editor, Neil deGrasse Tyson.

Neil deGrasse Tyson, host.

Investigate some of today's most exciting advances in scientific research.

Public genomes: To test or not to test? That's the question Neil deGrasse Tyson asks himself as he ponders whether to get a personal genetic profile that would predict his chances of contracting one of several serious diseases. In the interest of science journalism, Neil submits his spit for analysis. But would you?

Algae fuel: What if you could generate useable biofuels that didn't have the problems associated with corn ethanol or plant-based processes, didn't use arable land or fresh water, didn't rely on foodstuffs, cost very little, and could be "tuned" to produce hydrogen? Well, there is such a thing. It's algae, and it just may be our biofuel future.

Mystery of the Gakkel Ridge: Stretching more than a thousand miles deep beneath the Arctic Ocean, Gakkel Ridge is an eerie undersea landscape of volcanoes, hydrothermal plumes, and exotic creatures. but though Gakkel Ridge may be unique on Earth, it bears an enticing resemblance to Europa, one of Jupiter's many moons. Could exploring Gakkel bring us one step closer to finding out if Europa might host life?

Profile: Yoky Matsouka: Growing up in Japan, Yoky Matsouka was on her way to becoming a world-class tennis player, but it was hard to find a regular partner. So Matsouka designed and hoped to build her own: a robotic player that would never get tired. Injuries crushed her tennis dreams, but not her interest in robotics. Now Matsouka is a leader in the emerging field of neurobotics, a fusion of neuroscience and robotics.

Not rated.

DVD.

Closed captioned for the hearing impaired.