People go and search for the legendary Bigfoot creature.

Light is a fascinating phenomenon. Without light, there would be no cinema, no film – and no life. So light is at the origin of everything, and yet it remains invisible to the eye until it hits matter. This moment is – quite literally – the starting point of Thomas Riedelsheimer’s latest work, for the springtime spectacle of rainbow shreds in the cinematographer and documentary filmmaker’s flat became the starting point of a search for the origin of the images we form of this world. For this quest he dived deep into two spheres that seem to follow different laws but always strive to fathom the magical: physics and art.

Ocean Voyagers explores the familiar themes of motherhood and parenting in a world as unfamiliar as it is breathtaking. Featuring a precocious newborn humpback calf and his enormous 40 ton mother, we are taken on a journey of discovery into their world.

Many geneticists and archaeologists have long surmised that human life began in Africa. Dr. Spencer Wells, one of a group of scientists studying the origin of human life, offers evidence and theories to support such a thesis in this PBS special. He claims that Africa was populated by only a few thousand people that some deserted their homeland in a conquest that has resulted in global domination.

Described as being a film about determination, danger and the ocean’s greatest depths, James Cameron's "Deepsea Challenge 3D" tells the story of Cameron’s journey to fulfill his boyhood dream of becoming an explorer. The movie offers a unique insight into Cameron's world as he makes that dream reality – and makes history – by becoming the first person to travel solo to the deepest point on the planet.

Every year, on the steppes of the Serengeti, the most spectacular migration of animals on our planet: Around two million wildebeest, Burchell's zebra and Thomson's gazelles begin their tour of nearly 2,000 miles across the almost treeless savannah. For the first time, a documentary captures stunning footage in the midst of this demanding journey. The documentary starts at the beginning of the year, when more than two million animals gather in the shadow of the volcanoes on the southern edge of the Serengeti in order to birth their offspring. In just two weeks, the animal herd's population has increased by one third, and after only two days, the calves can already run as fast as the adults The young wildebeest in this phase of their life are the most vulnerable to attacks by lions, cheetahs, leopards or hyenas. The film then follows the survivors of these attacks through the next three months on their incredible journey, a trip so long that 200,000 wildebeest will not reach the end.

Lost Worlds looks at untouched aspects of nature in parts of the world where humans rarely tread. From plants, to animals, to geology, this artfully photographed documentary presents facets of the biological world that you are not likely to see anywhere else.

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Edeltraut Hertel - a midwife caught between two worlds. She has been working as a midwife in a small village near Chemnitz for almost 20 years, supporting expectant mothers before, during and after the birth of their offspring. However, working as a midwife brings with it social problems such as a decline in birth rates and migration from the provinces. Competition for babies between birthing centers has become fierce, particularly in financial terms. Obstetrics in Tanzania, Africa, Edeltraud's second place of work, is completely different. Here, the midwife not only delivers babies, she also trains successors, carries out educational and development work and struggles with the country's cultural and social problems.

This video examines the killer whale, one of nature's greatest predators. It is part of a multi-volume Time Warner series that markets the ferocious, killing aspects of various wild animals.

Fascinating footage of swooping bats, their remarkable habits and habitats, and close-up looks at their interesting yet eerie faces are featured in this documentary, volume seven of the Predators of the Wild series. Most bats eat insects, which may not always come to mind when one thinks of predators and prey -- although the fact that a swarm of bats can eat 30,000 pounds of insects in one night is staggering. Bats make up almost one-fourth of all of the mammals in the world, but only three species of bats are "true vampires" who rely on the blood of other animals for sustenance.

Shot in Africa, this video is a documentation of the behavioral patterns and territories of an assortment of carnivores and their prey. The program is part of a multi-volume Time Warner series that markets the ferocious, killing aspects of various wild animals.