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.

New York, 1980: three complete strangers accidentally discover that they are identical triplets, separated at birth. The 19-year-olds' joyous reunion catapults them to international fame, but it also unlocks an extraordinary and disturbing secret that goes beyond their own lives - and could transform our understanding of human nature forever.

Uranus and Neptune, two of the largest, farthest and strangest planets in our solar system. These two planets break all the rules. Of all the big planets, Uranus and Neptune remain the biggest enigmas. Today, astronomers are finally unlocking why these supersized snowballs are so weird. Can an ancient mega-collision reveal what knocked Uranus onto its side? Can a missing twin world unlock why one of Neptune's moons orbits the wrong way? And what is the energy that drives the fastest winds in the solar system?

A look into how the body defends itself against all odds through the stories of a nature survivalist, rancher twins, a doctor who survived Ebola and a cancer therapy recipient. The Immune System, essential to our survival every second, is the most complex and least understood piece of our biology.

Planets beyond our solar system are known to astronomers as exoplanets. They are at trillions of miles from Earth and yet, it might be possible to detect a faint signature of life in them. From the light of the stars they orbit that passes through the atmosphere of an exoplanet, it is possible to capture the chemical fingerprint of the elements in that atmosphere.
The fictional world Eden is orbiting not one star, but two. The light from its twin stars powers photosynthesis, pumping more oxygen into the atmosphere than in Earth, allowing life to thrive. Grazers are constantly alert to danger, because the canopy is home to predators perfectly evolved to live among the trees. In Episode 3, another topic are fungi and the role they could play on exoplanets. Ecologist Thomas Crowther talks about the role mycelial networks play in the Rothiemurchus forest in Scotland.

This episode tells the tale of what's broadly considered China's most creative dynasty - the Song (960-1279). Michael Wood heads to the city of Kaifeng, the greatest city in the world before the 19th century. Here in Twin Dragon Alley, locals tell him the legend of the baby boys who became emperors.
He explores the ideas and inventions that made the Song one of greatest eras in world culture, helped by China's most famous work of art, the Kaifeng scroll, which shows the life of the city in around 1120. A chef makes Michael a recipe from a Song cookbook, while a guide to 'how to live happy, healthy lives for old people', published in 1085 and still in print, is discussed with local women doing their morning exercises. The Song was also a great era for scientific advance in China. Michael steers a huge working replica of an astronomical clock, made by China's Leonardo da Vinci.
Then at a crunch Chinese Premier League match, Michael tells us the Chinese invented football! The golden age of the northern Song ended in 1127, when invaders sacked Kaifeng, but they survived in the south. At their new capital, Hangzhou, Wood joins locals dancing by the West Lake, while in the countryside he meets Mr Xie with his records of 40 generations of ancestors. The final defeat of the Song took place in a naval battle in the estuary of the Pearl River in 1279. When all was lost, rather than surrender to the Mongols, a loyal minister jumped into the sea with the young boy emperor in his arms. 'So ended the glory of the Song', Wood concludes, 'but a new age would arise... as in China, it always has!'.