Skiers, climbers, cyclists and even mushroom-pickers face surprising new risks in the mountains – and so do those who rescue them.

Blind spiders and whip scorpions, the future of climate change, photosynthesis in the dark – here's what the deepest places on Earth can reveal about life and the universe.

Atmospheric river storms have wreaked havoc on the West Coast, and are getting bigger. These scientists chase them in the sky to predict where they will strike.

Collecting data from the most extreme places on Earth can require the skills of the most extreme outdoor enthusiasts.

Flying into Antarctica is an enormous challenge for both pilots and aircraft. A 60-year-old Canadian plane turns out to be perfect for the job.

How tornadoes form remains one of nature's biggest mysteries. Meet the scientists who are chasing twisters to unlock the secrets of destructive storms.

Climate change is causing America's tornadoes to touch down in new locations, and occur at different times. Experts explain how best to prepare for these hard-to-predict disasters.