quantum mechanics

Are there parallel universes? Universes in which, rather than reading this article, you are still asleep; in which you are happier, unhappier, richer, poorer, or even dead? The answer is "possibly". It's a controversial claim but one that has won more and more followers over the last few decades.

Everyone knows what time is. We can practically feel it ticking away, marching on in the same direction with horrifying regularity. Time has enslaved the Western world and become our most precious commodity. Turn it over to the physicists however, and it begins to morph, twist and even crumble away. So what is time exactly?

This podcast featuring Paul Davies, a theoretical physicist and cosmologist at Arizona State University and Director of BEYOND: Centre for Fundamental Concepts in Science, explores this difficult question and accompanies our What is time article.

Are you fascinated by the double slit experiment? Then hold on to your hat for Wheeler's delayed choice experiment.

Could there be more than three?

A possible way of resolving the greatest problem of physics.

Explore the biggest problem in modern physics.

One of the most famous experiments in physics demonstrates the strange nature of the quantum world.

Untangling how the human perception of cause-and-effect might arise from quantum physics may help us understand the limits and potential of AI.

Researchers are exploring if quantum mechanics could make machine learning more powerful and shed light on evolution.

We reflect on the late John Conway, the thoughts he shared with us over two interviews, and the experience of meeting him as a person and a mathematician.

Find out why scientists trying to build quantum computers might do worse than talk to birds.