The Structure of Earth

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…or why we live on an onion made of magma.

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What is the Universe Made Of?

For over a century, physicists have searched for a blueprint of the universe in the form of a single mathematical formula. This ultimate formula would explain the fundamental building blocks of the universe -– the elementary particles and the different forces that govern them. In their quest, physicists dedicated themselves to the pursuit of mathematical beauty but they were to be met with unexpected setbacks. The discovery of the Higgs boson in 2012 at last confirmed the Standard Model –- a culmination of the theories of various physicists that finally seemed to explain what this universe is made of. But is this where the story ends...? Using the latest computer graphics and interviews with Nobel Prize-winning physicists, we look at the fascinating and dramatic story of the search for the ultimate formula.

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The fundamentals of space-time (Part 1)

Space is where things happen. Time is when things happen. And sometimes, in order to really look at the universe, you need to take those two concepts and mash them together. In this first lesson of a three-part series on space-time, hilarious hosts Andrew Pontzen and Tom Whyntie go through the basics of space and time individually, and use a flip book to illustrate how we can begin to look at them together.

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Speed Limits

Using high-speed cameras, Richard reveals the world hidden in the time it takes to blink.

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Into the Atom

Caught up in the race to discover the atom’s internal parts — and learn how they fit together — a young British physicist, Harry Moseley, uses newly discovered X-rays to put the Periodic Table in a whole new light. And a young American chemist named Glenn Seaborg creates a new element — plutonium — that changes the world forever, unleashing a force of unimaginable destructive power: the atomic bomb.

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Making Sound

At the Palace of Westminster, Helen teams up with scientists from the University of Leicester to carry out state-of-the-art measurements using lasers to reveal how the most famous bell in the world - Big Ben - vibrates to create pressure waves in the air at particular frequencies. This is how Big Ben produces its distinct sound. It's the first time that these laser measurements have been done on Big Ben. At the summit of Stromboli, one of Europe's most active volcanoes, Helen and volcanologist Dr Jeffrey Johnson use a special microphone to record the extraordinary deep tone produced by the volcano as it explodes. Finally, at the University of Cambridge's Institute of Astronomy, Helen meets a scientist who has discovered evidence of sound waves in space, created by a giant black hole. These sounds are one million billion times lower than the limit of human hearing

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Gravity and Me: The Force that Shapes Our Lives

Jim Al-Khalili investigates the amazing science of gravity, recreating groundbreaking experiments, including the moment when Galileo first worked out how to measure it. He investigates gravity waves, finds out from astronauts what it's like to live without gravity, sets out to find where in Britain gravity is weakest and so where we weigh the least, and helps design a smartphone app that volunteers use to demonstrate how gravity affects time and makes us age at slightly different rates.

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