In this episode, Michael demonstrates how our society is built on our search to find the answer to what makes up everything in the material world. This is a story that moves from the secret labs of the alchemists and their search for gold by the stone of the philosophers to the creation of the world's first synthetic dye - Purple - and onto the invention of the transistor. This quest may seem abstract and highly theoretical. Yet it has delivered the greatest impact on humanity. By trying to answer this question, scientists have created theories from elements to atoms, and the strange concepts of quantum physics that underpin our modern, technological world.

The film takes us inside the complex culture and history of Anonymous. The film explores early hacktivist groups like Cult of the Dead Cow and Electronic Disturbance Theater, and then moves to Anonymous’ own raucous and unruly beginnings on the website 4Chan. Through interviews with current members – some recently returned from prison, others still awaiting trial – as well as writers, academics and major players in various “raids,” WE ARE LEGION traces the collective’s breathtaking evolution from merry pranksters to a full-blown, global movement, one armed with new weapons of civil disobedience for an online world.

Around the world, a new generation of astronomers are hunting for the most mysterious objects in the universe. Young stars, black holes, even other forms of life. They have created a dazzling new set of super-telescopes that promise to rewrite the story of the heavens. This film follows the men and women who are pushing the limits of science and engineering in some of the most extreme environments on earth. But most strikingly of all, no-one really knows what they will find out there.

Few sounds are more beautiful or moving than the underwater songs of the humpback whale. Male whales compete with their songs, which often last for 10 minutes at a time, and can be repeated for hours on end. Whales separated by thousands of miles of sea will sing almost identical songs. Researchers have found that the songs change throughout the breeding months, following a mysterious pattern repeated across the waves. Whales also use sound to hunt. To catch herring, humpback whales release a stream of bubbles to form a shimmering, circular fishing net. Emitting a repetitive loud scream, they scare the fish into a tight ball, then lunge out of the water to swallow the shoal whole. Now it seems that the long-held image of the gentle giant must change to one of a ferocious and opportunistic hunter.

the story of rock singer "Pink" who is sitting in his hotel room in Los Angeles, burnt out from the music business and only able to perform on stage with the help of drugs. Based on the 1979 double album "The Wall" by Pink Floyd, the film begins in Pink's youth where he is crushed by the love of his mother. Several years later, he is punished by the teachers in school because he is starting to write poems. He slowly begins to build a wall around himself to be protected from the world outside. The film shows all this in massive and epic pictures until the very end where he tears down the wall and breaks free. Directed by Alan Parker

The Internet promises us escape from reality. We can go places we never thought possible and express ourselves as never before. But as we sit in our homes surrounded by screens, are we free... and safe? In this episode meet a woman pulled into an online cult from the safety of her bedroom; a former pilot who suffers from Electromagnetic Hypersensitivity and can only find relief in the absence of electricity and wifi; plus, a quadriplegic who uses cutting-edge adaptive robotics and virtual reality to transcend his body's limitations.