Although Everest had first been climbed in 1953, this was the first successful ascent to be made without supplemental oxygen.
Have you ever wondered what the highest mountain on earth was? Well, it is Everest. But, what about mountains on other planets?
Mount Everest is five-and-a-half miles high. Pretty impressive, unless you live on Mars. Learn more on this Moment of Science.
Flying is tougher than walking or running, right? So how come birds don't get winded and run out of breath?