Earth

A rogue mushroom is ripping through North American forests, after escaping from cultivation. As it runs riot, mushroom enthusiasts are rescuing the native fungi in its path.

With storms occurring between 140 to 160 nights a year, it's no wonder the area is a world record holder.

In the brutal world of deep caves, bacteria live in a miniature world of terror. The weapons they have evolved can defeat antibiotics – but now they are inspiring powerful new drugs.

Twenty years on, relive the iconic scene from Sir David Attenborough's Planet Earth that changed our understanding of how polar bears adapt to survive.

Retired astronaut Nicole Stott says being in space "does make you look at Earth differently".

From bone-eating snot-flowers to snowboarding scale worms, when a whale dies it becomes a colossal island of nutrients – attracting weird and wonderful creatures to feast.

Much of the Van Allen Probe was expected to burn up in the atmosphere, though Nasa said there was a "low" risk of people being struck by surviving components.