Supersymmetry is a theory which stipulates that for every known particle there should be a partner particle. For instance, the electron should be paired with a supersymmetric 'selectron,' quarks ought to have 'squark' partners, and so on.

I'd say many features of string theory don't mesh with what we observe in everyday life.

How can a speck of a universe be physically identical to the great expanse we view in the heavens above?

Far from being accidental details, the properties of nature's basic building blocks are deeply entwined with the fabric of space and time.

A watch worn by a particle of light would not tick at all. Light realizes the dreams of Ponce de Leon and the cosmetics industry: it doesn't age.

The idea that there could be other universes out there is really one that stretches the mind in a great way.

Before the discovery of quantum mechanics, the framework of physics was this: If you tell me how things are now, I can then use the laws of physics to calculate, and hence predict, how things will be later.