Nothing is colder than absolute zero, so it seems nonsensical to talk about negative temperature – but now there is a substance that must have just that. The revelation could shake up our ideas about ...

Discover how the concepts of zero and infinity revolutionized mathematics. Zero and infinity. These seemingly opposite, obvious, and indispensable concepts are relatively recent human inventions.

IT’S an absolute. Mathematics has put speed limits on cooling, finally proving a century-old law – that unless you have infinite time and resources, you can’t get to the absolute zero of temperature.