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hundreds of thousands of people compete every year
Both of these sports can be as hard as you want them to be. There are different routes , often called rock problems, for every level of rock climbing experience. There are routes that anyone of the street can climb - and there are rock problems that only a couple people in the world can get up.
preferably 2...I think
It's estimated that over 27,000 deaths resulted from rock climbing is 2010
a harness
1
Rock climbing is a sport. As with any sport you do not do anything else whilst engaged in that sport. Particularly so with extreme and dangerous sports.
As Many As possible.
As Many As possible.
Probably not. She was probably dropped off by a helicopter.
Yes, many rock climbing gyms offer parties. Search google for a gym near your area (for example, "Rock climbing gym near Atlanta, GA"). Call the gyms and ask about their parties.
You can check the History of rock climbing in Wikipedia.