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.

The strange theory of quantum mechanics has turned our conception of reality on its head. This article explores how things become fuzzy in the microscopic world and what this means for our understanding of events.

The possibility that there might be many parallel worlds has just become a little more likely.

Why are physicists unsure about what it means to say that something has happened? Anthony Aguirre and Sean Carroll explain.

Some general ideas in very few words and without equations.

Why did physicists at the beginning of the 20th century feel they needed a new — and strange — theory?

Here's a quick introduction to the most famous cat in the history of science. We hope it whets your appetite for quantum mechanics!

A very strange way of explaining away the strangeness of quantum mechanics.