The Human Capacity to Improve

Philip thorn broke the world record for eating nettles in 20 18 seconds. Ten years before, he had eaten forty eight feet of nettles - now that's more than doubled. How have humans got so much better at nettle eating in the space of ten years? i don't kow how people do it. And you're not allowed to bring your own nettles. Not allowed to bring any substances that might numb your mouth. Although iam sure some people have been tempted to try and smear non i do no cause i just thohght it were a trick.