So a map of Middle Earth annotated by J.R.R Tolkien has been found. Up for sale for £60,000. Anyone want to help me out? — @richard_dickson ...

The Earth has had at least five major ice ages, and humans showed up in time for the most recent one. In fact, we’re still in it.

Scientists have calculated just how cold it got on Earth during the depths of the last Ice Age, when immense ice sheets covered large parts of North America, South America, Europe and Asia.

This week, uncover some of the oldest ice on Earth, follow a dinosaur highway, learn how Pluto sealed the capture of its moon Charon with a “kiss,” and more.