The only thing scarier than a Xenomorph is this: One hundred years in the future, we're still watching Ice Age: Continental Drift. Without context, the reference might not make a lick of sense.

First, what is an ice age? It’s when the Earth has cold temperatures for a long time – millions to tens of millions of years – that lead to ice sheets and glaciers covering large areas of its surface.

A group of scientists think they can now predict when the next ice age could grip Earth, but don't worry, it's not for a very long time. An ice age should begin in about 10,000 years, but its onset is ...