What's behind a pulse? The second episode dives into the world of an ice climber, a bus driver, a woman in labor, and a senior dance club to show how the human heart and the circulatory system power our physical and emotional lives, and create the pulsing rhythm of our world.

The episode is a journey through the human gut and the process of turning food into energy to keep the body going. Humans have turned eating into culture, a way to celebrate our roots, to bring us together. But food is really just one thing: Fuel. It's where you get the power to live your life. Even when you're sitting completely still, your body needs a lot of energy to stay on. But nowhere is the need for fuel more apparent than when you push yourself to the absolute limit. And the microbiome, the bacteria living in our gut, plays a great role in all this.

How do you react to the world around you? Through the lens of a boxer, a first responder, a cell tower climber and a man with a bionic limb, we'll go deep into the universe of the most powerful machine on earth: the human brain and the vast nervous system it controls.
The human body is full of systems, but there's one system that controls all the others, and it might be the one that truly makes you you: The nervous system.

Twenty years ago, at 9.03am on 11 September 2001, America was under attack. President George W Bush was sitting in front of seven-year-olds in a classroom in Florida. Members of the president’s security detail thought the next plane could be aimed at them. The film is a claustrophobic clock-ticking thriller and tells the story of the presidency on arguably the most consequential day in recent history. As the clock ticks, the administration makes the greatest decisions of their lives: should they order fighter jets to shoot on American civilians? Should the president declare war or calm a battered nation? How would the leadership of the most powerful nation on earth grapple with the national and international implications?
This documentary tells the definitive story of the Bush administration through 12 hours of that momentous day, with first-hand testimony from President Bush, Vice-President Dick Cheney, National Security Advisor Condoleezza Rice and other senior staff who had their hands on the levers of power. The events of that day led to two decades of conflict in Afghanistan and Iraq. As America and its allies now withdraw from Afghanistan and the Taliban resume control, this is the story of how it all began.

America says eight out of ten industrial espionage cases now involve China. Governments around the world are uncovering secret operations to expand China's influence - the work of a little-known branch of the Chinese Communist Party called the United Front Work Department. President Xi has called it his 'magic weapon'.
Jane Corbin investigates this powerful but shadowy organisation. Has influence become interference as China bids to become the most powerful nation on earth?

A mammoth Tsunami strikes the eastern seaboard. It would be a disaster of epic proportions. Some scientists believe this catastrophe could happen one day, but how? This episode shows the Atlantic island of La Palma has collapsed several times in mega-landslides. Another could trigger a tsunami with enough power to cross the Atlantic Ocean and decimate the US East Coast.