You don't have to be an arborist or an 8-year-old to go out and climb a tree. Recreational tree climbers come in all forms -- you just need some instruction, the right gear and a minimal fear of heights.
Before people go out on a hiking or climbing expedition, they typically prefer to know what's in store for them. How difficult will a climb be? Will it be relatively easy, or are there many obstacles along the way? Climbing grades attempt to answer these questions.
25-year-old, Lakpa Tharke Sherpa, set a world record when he stripped naked on the summit of Mt. Everest in 2006. He faced also created controversy because the mountain is considered sacred. Learn about this record here.