Cambridge University scientists say they have seen four-stranded DNA at work in human cells for the first time.

The famous "molecule of life", which carries our genetic code, is more familiar to us as a double helix. But researchers tell the journal Nature Chemistry that the "quadruple helix" is also present in our cells, and in ways that might possibly relate to cancer. [1]

No matter what they finally find out, one thing is for sure: life (and life's ingredients) are not as easy to categorize as our limited human mind thinks...