Professor of physics Jim Al-Khalili investigates the most accurate and yet perplexing scientific theory ever - quantum physics, the perplexing theory of sub-atomic particles. Turning his attention to the world of nature, can quantum mechanics explain the greatest mysteries in biology? The European robin navigates using one of the most bizarre effects in physics - quantum entanglement, a process which seems to defy common sense. Jim finds that even the most personal of human experiences - our sense of smell - is touched by ethereal quantum vibrations. According to new experiments it seems that our quantum noses are listening to smells. Jim discovers that the most famous law of quantum physics - the uncertainty principle - is obeyed by plants and trees as they capture sunlight during the vital process of photosynthesis. Jim wonders if the strange laws of the sub-atomic world, which allow objects to tunnel through impassable barriers in defiance of common sense, could effect the mechanism by which living species evolve?

In this episode, Helen seeks out the colours that turned planet Earth multicoloured. To investigate the essence of sunlight Helen travels to California to visit the largest solar telescope in the world. She discovers how the most vivid blue is formed from sulfur atoms deep within the Earth's crust and why the presence of red ochre is a key sign of life. In gold, she discovers why this most precious of metals shouldn't even exist on the surface of the planet and in white, Helen travels to one of the hottest places on Earth to explore the role salt and water played in shaping planet Earth.

The true story of physicist J. Robert Oppenheimer's journey from driven and ambitious scientist to remorseful and tormented man struck hard by the gravity of what he had done. For Oppenheimer, the successful detonation of the first atom bomb validates years of tireless work. But in this moment of seeming triumph, Oppenheimer sees before him a destructive power of almost supernatural magnitude.
The films explores how one man's brilliance, hubris and relentless drive changed the nature of war forever.

Salvador Dali's strange crucifixion is often called the greatest religious painting of the 20th century. Yet its artist was a notorious blasphemer some of whose work had outraged the Catholic Church. The Christ of St John of the Cross by Salvador Dali is the first of two extraordinary crucifixions painted by Dali in the early 1950s. The painting is based on a 'cosmic dream' Dali is said to have had, in which the nucleus of the atom was a figure of Christ himself.
The painting offers a surrealist view of the crucifixion of Christ, and is based on a drawing by the 16th century Spanish friar Saint John of the Cross. But Dali's vision was somewhat unique, using an unusual artistic perspective in which Christ is seen from above. His Christ of St. John of The Cross was inspired by a weird mix of Spanish mysticism and nuclear physics, with his Christ being modelled by a Hollywood stuntman. It's also a masterpiece of painting technique.

In this episode, Michael demonstrates how our society is built on our search to find the answer to what makes up everything in the material world. This is a story that moves from the secret labs of the alchemists and their search for gold by the stone of the philosophers to the creation of the world's first synthetic dye - Purple - and onto the invention of the transistor. This quest may seem abstract and highly theoretical. Yet it has delivered the greatest impact on humanity. By trying to answer this question, scientists have created theories from elements to atoms, and the strange concepts of quantum physics that underpin our modern, technological world.

Dr Janina Ramirez embarks on a journey through six decades of the BBC archives to create a television history of one of the most celebrated figures in art - Leonardo Da Vinci. Ramirez shows how experts and art presenters have turned to television to bring Leonardo's artwork out of galleries and into our living rooms. Through television they have explored the origins of Leonardo's boundless curiosity, his pioneering use of light and shade, and his remarkable scientific exploration.
Along the way Dr Ramirez discovers Britain's little-known version of The Last Supper, the gruesome ways Leonardo acquired his anatomical knowledge - and even what lies beneath the Mona Lisa.