In this BBC Four 90-minute special, physics professor Jim Al-Khalili investigates the amazing science of gravity.

War reporter Bob Woodruff leads veterans on an Arctic expedition to test a cure for post-traumatic stress and depression: the experience of awe in nature. As they trek across one of the world’s most dramatic and pristine wildernesses, researchers monitor changes to their physical and emotional well-being. Could this be the medicine they’ve been looking for?

Who are the Men in Black? Many have reported their own Men in Black experiences and eye witness accounts since the beginning of the UFO cover-up history. Walk through the true history of Men in Black events from the 1940s until now.

The story behind one of the most revered and mysterious characters in WWE history and the man himself, Windham Rotunda, has never been documented, until now.

Serial Killer Culture examines the reasons why artists and collectors are fascinated by serial killers.

New York magazine’s October 2005 issue sent shockwaves through the literary world when it unmasked “it boy” wunderkind JT LeRoy, whose tough prose about his sordid childhood had captivated icons and luminaries internationally. It turned out LeRoy didn’t actually exist. He was dreamed up by 40-year-old San Francisco punk rocker and phone sex operator, Laura Albert.

This documentary chronicles Diomedes Díaz’s rise as one of Colombia’s most iconic singers, and his downfall after being accused of killing a fan.

This real-life thriller tells the story of one of Israel’s prized intelligence sources, recruited to spy on his own people for more than a decade. Focusing on the complex relationship with his handler, The Green Prince is a gripping account of terror, betrayal, and unthinkable choices, along with a friendship that defies all boundaries.

A Man Vanishes examines the concept of Johatsu, tackling the phenomenon of people missing in Japan over the years. It picks one such person from the list, someone who had seemed to disappear from the face of the earth due to embezzlement from his company, and the filmmakers begin an investigative documentary into the reasons behind and attempt at tracking him down.

The programme follows Theroux as he travels to the United States to meet people who own animals normally found in Africa and Asia, including big cats and dangerous primates. In the programme, Theroux visits GW Exotic Animal Foundation in Oklahoma.

Anoosh and Arash are at the center of Tehran’s underground techno scene. Tired of hiding from the police and their stagnating career, they organize one last manic techno rave under dangerous circumstances in the desert. Back in Tehran they try their luck selling their illegally printed music album without permission. When Anoosh is arrested, there seems to be no hope left. But then they receive a phone call from the biggest techno festival in the world. Once landed in Switzerland, the haze of the instant euphoria evaporates quickly when the seriousness of the situation starts to dawn on them.

Following a group of British skateboarders on their journey towards Tokyo 2020, where skateboarding will make its debut as an Olympic sport, Boarders tells the story of skateboarding in the UK – from arriving in the early 70s all the way…