Quick! How many stars are on this flag? No, it's not the American flag we use now, but a pattern with 51 stars, which will be needed if Puerto Rico becomes a state. Mathematician Skip Garibaldi worked out the most geometric layouts that will accommodate more stars if the flag has to be updated if and when states join the union. Slate posted an interactive flag calculator, in which you can enter a number of states, from one to a hundred stars, and see the best pattern according to a computer program Garibaldi created. Some numbers have more than one pattern, with up to six styles. Read all about it in this article from Chris Wilson at Slate. Link
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