Find out what it takes to create a twister. And see what a Category 5 tornado can do. Check out the Tornado Handbook.

  A radical new theory suggests that it was volcanoes, not an asteroid that wiped out the dinosaurs. Find out more.

  Meet the team that will take on Everest. And watch behind-the-scenes video on filming at the top of the world.

  Okay, so Mike's now done 150 jobs. See how many you remember; take the Super Fan Quiz. And go behind-the-scenes at Mike's party.

  Follow, as it happens, the struggle to save an infant mountain gorilla whose mother was slaughtered by poachers.