In every dividing cell, a time comes when the two copies of the genome need to be separated. The aptly named enzyme separase springs into action and gets the job done. Unleashing separase at any other ...

Mathematicians were disturbed, centuries ago, to find that calculating the properties of certain curves demanded the seemingly impossible: numbers that, when multiplied by themselves, turn negative.

Imaginary numbers might seem like unicorns and goblins — interesting but irrelevant to reality. But for describing matter at its roots, imaginary numbers turn out to be essential. They seem to be ...