There can't be only one

There s a concept that I ve heard called by a lot of different names, but my favorite name for it is the Highlander problem , which refers to the catchphrase of the campy-yet-still-quite-fun Highlander movie/ TV franchise. In Highlander , immortal beings secretly live amongst us and sword-fight each other in hopes of being the last one standing, who will then get to rule the world forever. And…