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.

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.

Revolutionary laser tools that have changed our lives have won the Nobel prize in physics.

PhD student Demian Goos talks to us about his work on qunatum mechanics.

The "quantum mechanic" talks about how quantum computers might impact society and the limits of measurement.

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Most of us know what we mean when we say that something has happened. For theoretical physicists, however, this isn't an easy question. Sean Carroll of the California Institute of Technology explains why it's hard to define events and what to do about it.

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Most of us know what we mean when we say that something has happened. Theoretical physicists, however, struggle with the concept of an event. Why?