[Joe and I wrote a student paper--explanatory, not original research!--on kink and antikink mechanical solitons together for Math 222 back in college, as I'd heard of them in high school and thought they would be fun to explore. It used to be that you would get suuuuuuper sexy NSFW results for that search term. Things are better now, but man...I realize now that whichever mathematician or physicist named the suckers knew exactly what they were doing! Back then, as a teen, I thought it was a horrible coincidence.]