The Volkswagen Roller is a new-age roller skate. It’s autonomous, and hands-free. The design comes with two main hubless wheels and two retractable rear wheels. Each roller comes with a hard-plastic s(Cool Designs Inventions)
In the statistician Francis Anscombe demonstrated the importance of graphing data. The Anscombe's Quartet shows how four sets of data with identical simple summary statistics can vary considerably when graphed.