It is also one of the few sports that is still constantly evolving. Other sports, such as football, have had the same rules for hundreds of years which, for the most part, have not been changed. The difference between the mentality of a climber and that of other athletes is that for climbers nothing is impossible. For example, in football players find it impossible to catch the ball with their hands because it would result in a penalty. But climbing in and of itself comes from the impossible. Before the birth of climbing, you looked at a sheer cliff and the thought of someone climbing it was just not plausible. Yet, one day someone did it, and from there the sport blossomed. Since then, mountaineers have shattered assumptions and expectations. The El Capitan rock face in Yosemite had been considered impossible until 1957 when Warren Harding achieved the first ascent (Fimrite 1). The 5.0 and V scales, used to rate the difficulty of a climb, have had to be changed to compensate for the routes people are completing that were previously considered purely fictional. One of the most recent feats in climbing was the 2008 freeBASE ascent of the Eiger, located in Switzerland, by Dean Potter (Thomasma 1). FreeBASE means he climbed it without a rope and instead had a lightweight parachute attached to his back. Then, in the event of a fall, it would open the parachute and return to earth. This new style of climbing has opened the doors to many more "impossible" crags than one would have thought