1,2,3,4,10,11,12,14,15,16,18,20.
About 4, I remember how I learned about it. In 1996 I met the guy who, by that time, had climbed the Himalayas the most(in Sri Lanka). He never went up to Everest but every year he went to the base camp. He had an ice axe on his wall. When I was looking at it he...