A pill that could extend the human lifespan; space elevators; satellite imaging of Mayan ruins; and a profile of “The Bacteria Whisperer.”

This program asks how close are scientists to developing a pill that could extend the human lifespan and whether space elevators will one day make it possible for people to vacation in orbit. Viewers also find out how satellite imaging is revolutionizing archeology and helping to uncover 2,000-year-old Mayan ruins - as a result of one man's perilous journey into the jungle. The episode also profiles "The Bacteria Whisperer," who has discovered a language that nearly all bacteria use to communicate, something that could have huge implications for developing new antibiotics.