A New Upper Bound on Rubik's Cube Group
The Rubik Cube has had more success inhabiting pop consciousness than any other big discrete object. I never got really good at it myself; I could solve one side perfectly well, but that's no big achievement. I suppose my ability to hold parallel data in my head has improved in the past 15 years, but I doubt that would be the best use of my time and mental energy. It truly is a mathematical gift that keeps on giving.