Chad Thesen is a passionate fan of anime, video games, series, and films (Both animated and live-action). Many years of experience have left him with a deep knowledge of these mediums' intricacies and ...

I HAVE just read Dr. J. W. Evans's letter on this subject (NATURE, January 19, p. 80). His object clearly is to arrange and name the classes according to their axes and other elements of symmetry. I ...