NOVA scienceNOW

Aging - Will research into "longevity genes" help us live longer and healthier lives?Space Elevator - Can we build a 22,000-mile-high cable to transport cargo and people into space?Maya - NASA archeologists use satellites to pinpoint ancient ruins buried deep in the jungle.Profile: Bonnie Bassler - Her insight into how bacteria "talk" has launched a revolution in biological and medical research.