So, I used to be ticklish, like most people. I hated being tickled by friends and siblings. I desperately wanted to un-ticklish myself, but had no idea how – or if it was even possible. As a kid, I knew that adults were also ticklish, so I figured that it wasn’t something that people out-grew over time.

When I was about 15 years old, I devised a plan to make myself not-ticklish. I tried several tests by myself, which proved to be pointless and ineffective. No matter how much I tickled...