An amateur mathematician in the United Kingdom may have solved a 60-year-old problem in geometry, garnering the attention of researchers. CNN reported David Smith, a retired printing technician, has discovered a shape known as an “einstein,” which can be tiled over a surface without the pattern repeating. The outlet noted mathematicians first began working on this problem in the 1960s. Smith and three coauthors, Joseph Samuel Myers, Craig S. Kaplan, and Chaim Goodman-Strauss, published a paper explaining Smith’s finding. Smith, who says he is “always looking for an interesting shape,” wrote a blog post to serve as a “scrapbook” of...