Why Isn't "Zero G" the Same as "Zero Gravity"?

56:18

Just outside Paris, inside a hi-tech vault, and encased in three vacuum-sealed bell jars, rests a small metallic cylinder about the diameter of a golf ball. It may not look like much, but it is one of the most important objects on the planet. It affects nearly every aspect of our lives including the food we eat, the cars we drive, even the medicines we take. It is the kilogramme, the base unit of mass in the International System of Units. This small hunk of metal is the object against which all others are measured. Yet over time, its mass has mysteriously eroded by the weight of an eyelash. A change that, unbeknownst to most, unleashed a crisis with potentially dire consequences. Follows the ensuing high-stakes, two-year race to redefine the weight of the world, and tells the story of one of the most important objects on the planet.

2021 • Physics

14:57

As the theories on quantum mechanics begin to take shape, the 1927 Solvay Conference becomes a battleground for new scientific ideas. The world’s most brilliant minds, including Einstein and Bohr, try to crack the nature of the subatomic world. Join Brian Greene in exploring this fascinating period.

S1E2 • Exploring Quantum History with Brian Greene • 2016 • Physics

41:45

It appears we live in a universe filled with light. But scientists are now certain there is far more matter in the dark portions of our universe.

S5E10 • Through the Wormhole • Physics

58:31

Early Earth was a canvas for the vast new palette of the colours of life, with the diversity of human skin tones telling the story of how humanity spread and ultimately conquered the planet. Dr Helen Czerski explores the true masters of colour - which are often the smallest and most elusive - travelling to the mountains of Tennessee to witness the colourful mating display of fireflies, and revealing the marine creatures that can change the colour of their skin in order to hide from the world.

S1E2 • Colour: The Spectrum of Science • 2015 • Physics

5:03

The double-slit experiment is a demonstration that light and matter can display characteristics of both classically defined waves and particles; moreover, it displays the fundamentally probabilistic nature of quantum mechanical phenomena.

Physics

44:09

The 100 greatest discoveries in Physics!

Physics