This episode takes a look at the petroleum industry and the many products derived from oil used in the United States.
Imagine it: Rubber, plastic, nylon, aerosols, resins, solvents, & lubricants; none can exist without oil, still hailed as Black Gold. Even if we stopped driving our cars tomorrow, America would still need 5 million barrels of oil a day - more than all of Southern Europe combined. From the shirt on your back to the waxy sheen of a beautiful apple, the first secret of oil is that it's everywhere you look. Oil is used to lubricate machines, weapons, and even skin. It provides the chemical building blocks for plastics, rubber, synthetic fibers and pharmaceuticals.

Laura Dodsworth photographs 100 women and interviews 18 of the participants, aged between 19 and 77, and asks them about how their vagina has shaped their lives. They share their experiences of starting periods and pubic hair grooming, the trauma of rape and FGM, and the joy of orgasms.

Examining the story of the Victorian engineer Isambard Kingdom Brunel, the man who designed the world's fastest railway, longest suspension bridge and largest ship. Over 150 years on from his death, this film goes back in time to explore the extraordinary stories behind Brunel's greatest creations, including the Great Western Railway and the Clifton Suspension Bridge. The film also explores the wider story of what kind of Britain Brunel's genius was able to flourish in.

A crew of women embarked on an ambitious sailing expedition around the UK to raise awareness of ocean plastic and sample the water to see what damage is being done. Hannah Thomas-Peter joined them on the month-long voyage and documented their voyage of discovery.

Sue Perkins brings her unique blend of humour and compassion to this extraordinary journey along one of the most contentious borders in the world.

Adnan Sarwar follows the trail of migrants dicing with death as they attempt to cross the frozen Alpine peaks marking the border between Italy and France. Braving altitudes of up to 2,500 metres and temperatures as low as minus 20, many have died in their attempt to seek safety, having been denied asylum in Italy or threatened with deportation back to the countries from which they fled.

In March 2010, two American women, including one who named herself 'Jihad Jane', were arrested in a number of high-profile arrests in Waterford, Ireland, which were trumpeted by the US attorney's office as 'the new face of terrorism'. Facing huge jail sentences, the two women pleaded guilty but now for the first time ever, with unprecedented access, Jihad Jane tells the story of the most absurd terror cell ever to come together.

Looks at the life of South African singer and civil rights activist Miriam Makeba. Forced into a life of exile for exposing the harsh realities of apartheid, Makeba was the first African musician to win international stardom.

Chidera Eggerue explores people's relationship with pubic hair, investigating why so many women remove their pubic hair when even a few decades ago it wasn't seen as necessary. Along the way, she challenges herself and her peers to grow out their pubic hair and put on an exhibition in which they reveal their naked, natural bodies to the world.