In 2017, fidget spinners took the toy world by storm, to an unprecedented level. Sure, there are toy crazes every year, but never before have we seen 73 spots in Amazon's top 100 best-selling toys list taken up by different variations of exactly the same toy. For months, you literally couldn't walk down the street without seeing one and, for a while, they were a serious commodity - stores were selling their entire stock in hours and simply couldn't keep up with demand. As som