We can survive for weeks without food, but only days without water: it is the essential element of life. Yet many millions of us live in parched deserts around the world. In the second episode of Human Planet, we discover how the eternal quest for water brings huge challenges - and ingenious solutions - in the driest places on Earth. Battling through a sand storm in Mali, Mamadou must get his cows to a remote lake but desert elephants have arrived first. Can he find a safe way through the elephant blockade? Alone for weeks on end, Tubu women and children navigate the endless dunes of the Sahara. How does young Shede know where to find the last oasis, three days walk across the sea of sand? At the height of the drought we witness a spectacular frenzy: two thousand men rushing into Antogo Lake to catch the fish trapped by the evaporating water. When the rain finally arrives in the desert it's a time for flowering and jubilation - and love. The Wodaabe men of Niger put on make-up for an intoxicating courtship dance and beauty contest.

Ideas about time and space are explored in the changes that constellations undergo over time, the redshift and blue shift measured in interstellar objects, time dilation in Albert Einstein's theory of relativity, the designs of both Leonardo da Vinci and spacecraft that could travel near light speed, time travel and its hypothetical effects on human history, the origins of the Solar System, the history of life, and the immensity of space. In Cosmos Update, the idea of faster-than-light travel by wormholes (researched by Kip Thorne and shown in Sagan’s novel Contact) is discussed.

A half-bull half-man freak of nature, the Minotaur is one of mythology's most terrifying monsters. A bizarre tale of bestiality, human sacrifice and war, the myth of the Minotaur endures as a symbol of the beast inside all men. But archeological research has uncovered clues suggesting the Minotaur and its terrifying labyrinth were just as much fact as they were fiction. Could they have been inspired by a real place that still exists to this day?

Nascar: The IMAX Experience, literally transports auto racing fans and other spectators into the driver's seat to experience all the heart-pounding thrills and intense drama of the unpredictable action on the track. This groundbreaking film also goes behind the scenes to uncover the science, technology and teamwork that fuel America's most popular spectator sport.

Angela Rippon and Dr Chris van Tulleken travel the world in search of the latest science that could help us all stay young and healthy for longer. They investigate the best ways to help both our bodies and brains age better. Up first is the body, and Angela travels to Germany to join a groundbreaking study which reveals the exercise that holds off ageing the most. Chris visits America to find out about the unexpected diet that can add years to our lives. And in Ecuador we meet a seventeen-year-old who looks like a child to discover how scientists hope he may hold the key to preventing the diseases of ageing.

The Search for Freedom is the story of a cultural revolution fueled by the human desire to live in the moment and do what makes you feel the most alive. DIrector Jon Long presents this visceral look at the pioneers of extreme sports, including skateboarder Danny Way and motobiker Robbie Madison, and the human stories behind their search for thrills.