Why do people climb mountains? Yes, they can see beautiful scenes from the top of the mountain, but of course it's not the main reason. Challenge, they need something challenging and perhaps, dangerous. Millions of years ago humans had a lot of dangers in their life. Every day they had to put a great effort just to survive. Today it's different, you don't have to escape from predators or hunt a bison for living. Perhaps, all your physical activity during the day is few steps from a car to an office and back. However, your body still remembers previous times and needs activity and your mind needs challenges. So that's why climbing and other dangerous sports are so popular nowadays.