Modern headlines are claiming mindfulness may cure anxiety, depression, and a whole host of other health problems. How can this simple practice of watching your own breath change the way your brain works? And can that change your life? The fourth episode of the series looks at the power of mindfulness and meditation. It examines different kinds on meditation (transcendental, dynamic, and religious) and notes that they are different from mindfulness meditation (Satipatthana). Also it talks to neuroscientists who discuss what happens in the brain during meditation.

In January, 2015, American rock climbers Tommy Caldwell and Kevin Jorgeson captivated the world with their effort to climb the Dawn Wall, a seemingly impossible 3,000 foot rock face in Yosemite National Park, California. The pair lived on the sheer vertical cliff for weeks, igniting a frenzy of global media attention. But for Tommy Caldwell, the Dawn Wall was much more than just a climb. It was the culmination of a lifetime defined by overcoming obstacles. At the age of 22, the climbing prodigy was taken hostage by rebels in Kyrgyzstan. Shortly after, he lost his index finger in an accident, but resolved to come back stronger.
When his marriage fell apart, he escaped the pain by fixating on the extraordinary goal of free climbing the Dawn Wall. Blurring the line between dedication and obsession, Caldwell and his partner Jorgeson spend six years meticulously plotting and practicing their route.

Ottoman Sultan Mehmed II wages an epic campaign to take the Byzantine capital of Constantinople. Twenty-three armies have tried to take the legendary city and all have failed. Out of the carnage, one ruler will emerge victorious and shapes the course of history for centuries. For one empire to rise, another must fall.
The Ottomans, former Anatolian warlords and nomads who've built a burgeoning empire are the biggest threat to the Romans' 1100-year reign. The death of Ottoman Sultan Murad II in 1451 unleashes a chain of events that will soon bring the Ottomans and Romans to the brink of war. After claiming the Ottoman throne, Mehmed II sends an unmistakable signal to Byzantine emperor Constantine XI.

In a provocative documentary, environmental campaigner George Monbiot examines the disastrous impact that farming animals for meat has had on the planet. He argues that the biggest problem driving us towards global disaster is how we feed ourselves, particularly on meat
George looks at alternative food sources, including synthetic meat, and a process that produces protein from just bacteria and air, and also explores revolutionary ideas that could change agriculture as we know it.

Two and a half thousand years ago, the Greek philosopher Socrates worried that the wide use of writing would have a negative impact on people's minds. He said that writing would create forgetfulness, because people will not use their memories. They would trust the external written characters and not remember themselves. In a world with an ever-growing tech industry, Michael Stevens tries to find out what effect technology has on our brains. He finds Technology isn't just changing our lives, it's changing our brains. In his experiments he tests what just 10 days of gaming does to things like our spatial memory.

How what began as a passion for the tantalising possibilities of jetpacks became an obsession. Shot over ten years, this documentary chronicles Australian David Mayman's seemingly impossible quest to fulfil his childhood dream to build and fly the world’s first jetpack.
His ambition, which nearly cost him his life and family, culminates in an attempt to make the world's first jetpack flight around the Statue of Liberty.