The Thread of Life

After a woman's at-home DNA test reveals multiple half-siblings, she discovers a shocking scheme involving donor sperm and a popular fertility doctor.

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.

The documentary tells two very different human fates in the 1920s Soviet Union. Nikolai Vavilov was a botanical genius, Trofim Lyssenko was an agronomist who made great promises and fake inventions. Each of them tried to solve the country's nutritional problem, but only one succeeded.

In a television first, Fat Family Tree sets out to prove that unlocking the secrets of a fat family’s genes can help provide the answer to their lifelong weight problems. Presented by Dr Dawn Harper (Embarrassing Bodies), Fat Family Tree uses cutting edge genetics to decode the genes of an overweight family for whom all other attempts to shed the pounds have not worked. Discovering how the family’s genes have put them at risk of excessive weight gain is the first step to devising a diet to help them beat their genes. Based on the latest science, the programme’s “gene-busting” diet also promises fail safe diet tips that could help all of us lose weight.

The film tells a very personal story from two perspectives: our protagonist is both doctor and patient. As a patient, he has struggled with recurring depression for years, and as a doctor he wants to find out why. The search for the origins of his illness leads him into the realm of his own genes and casts light on the fundamental changes facing modern society as a result of the tremendous progress being made in the field of genetic sequencing. Along the way, he meets a host of people – researchers, artists, visionaries – who have developed their own very individual approach to genetic coding and are drawing attention to the social significance of genetic technology. The film does not restrict itself to a scientific view of the subject but also makes use of artistic visions and more playful approaches to genetic blueprints.

A well-preserved mammoth carcass is found in the remote New Siberian Islands in the Arctic Ocean, opening up the possibility of a world-changing “Jurassic Park” moment in genetics.

Can science help us understand these crimes?

Earth teems with a staggering variety of animals, including 9,000 kinds of birds, 28,000 types of fish, and more than 350,000 species of beetles. What explains this explosion of living creatures—1.4 million different species discovered so far, with perhaps another 50 million to go? The source of life's endless forms was a profound mystery until Charles Darwin brought forth his revolutionary idea of natural selection. But Darwin's radical insights raised as many questions as they answered. What actually drives evolution and turns one species into another? To what degree do different animals rely on the same genetic toolkit? And how did we evolve?

If we compare ourselves with our genetically closest living relatives, the chimpanzees, we have few physical advantages. We are far weaker, cannot move nearly as fast, and do not have the same climbing capabilities. Instead, humans excel in areas such as architecture, religion, science, language, writing, art, culture, and ideas. These achievements are due to our larger brain that contain billions of neurons. It was the rapid growth of our brain, originating about 2 million years ago, that allowed us to be the predominant species of the world. What caused this rapid growth of our cerebral cortex? Researchers worldwide have asked this question for many years, but now there finally seems to be an answer.