We float along the river of time. But does that river have a source? Where did time come from? Some believe time and space are one thing, and the Big Bang started the cosmic clock. Others believe the universe existed for almost half a million "years" before light could move and time began. Still others say time is older than our universe. But what if time itself is an illusion? Incredible new experiments may hold the answer. One groundbreaking experiment gives us the power to punch holes in time…and another may create a machine that operates outside time’s boundaries!

Andrew Graham-Dixon explores how Russia changed from a feudal nation of aristocratic excess to a hotbed of revolution at the beginning of the 20th century and how art moved from being a servant of the state to an agent of its destruction. From monuments that celebrate the absolutism of the tsars to the epic Russian landscape as inspiration; from the design and construction of gold and glittering palaces to the minutiae of diamond-encrusted Faberge eggs; and eventually to the stark and radical paintings of the avant-garde, the journey through Russian art history is one of extraordinary beauty and surprise.

Orbits are the dynamics that drive the universe. From the smallest asteroid to the largest super-cluster, everything in the universe is in orbit. We owe our very existence to the stability of earth's orbit — it gave us life and keeps us safe. But we are the freaks. Everywhere else we look we find orbits are chaotic, unstable, and violent. Beyond our solar system we find planets that are blow-torched, stars that eat each other, and black holes that destroy everything in their path. Yet on the very largest scale, orbits are also a creative force. clashing galaxies give birth to new stars and new worlds. on the galactic scale orbits even construct the fabric of the universe itself.

In the boreal forests of Europe, a young brown bear clashes with wolves and tries to find a mate beneath the stars. On the edge of the Arctic Circle, lies an enchanted wilderness. In Europe's boreal forest, It's so far north that in winter, nights can last 20 hours. This woodland is home to a population of secretive bears that lives most of their lives in the dark. But now, using low-light cameras we can see their nighttime world as if it were day.

Forget the Big Bang. The real moment of creation was the Cosmic Dawn - the moment of first light. It's the moment the first stars were born, the moment that lit up the Universe, and made the first structure and the first ingredients of life. This is the scientific version of the story of Genesis. The Big Bang gets all the credit for creating our universe. But in fact, the universe it gave was dark and boring. There were no stars, no galaxies, just a vast, black fog of gas - the cosmic dark ages". But, after a hundred million years of nothing, came a dramatic moment of transformation - the Cosmic Dawn. Astronomers are now trying to witness this cosmic dawn. For the first time they have the tools to explore the very first stars of the universe and to tell the scientific story of our creation.

For the last 40 years, the photographer Sebastião Salgado has been travelling through the continents, in the footsteps of an ever-changing humanity. He has witnessed some of the major events of our recent history; international conflicts, starvation and exodus. He is now embarking on the discovery of pristine territories, of wild fauna and flora, and of grandiose landscapes as part of a huge photographic project, which is a tribute to the planet's beauty". Sebastião Salgado's life and work are revealed to us by his son, Juliano, who went with him during his last travels, and by Wim Wenders, himself a photographer.