String theory is one of the most famous ideas in modern physics, but it is also one of the most confusing.

At its heart is the idea that the fundamental particles we observe are not point-like dots, but rather tiny strings that are so small that our best instruments cannot tell that they are not points.

It also predicts that there are extra dimensions to space beyond the obvious length, breadth and depth, but we do not experience them because they are bunched up in tiny spaces.

While these notions are deeply strange, the key issue for string theorists has actually been the difficulty of testing their ideas.

Edward Witten, one of the leading proponents of string theory share with us some insights. We’ve put together a beginner’s guide to one of physics’ strangest imaginative feats.

String theory may predict our universe

Why is our universe the way it is? If some of its fundamental laws were even slightly different, our world would be a strange and lethal place. Instead, it seems exquisitely tuned to make life possible. String theory could explain why.

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