A good place to start is an article by Jessica Contrera in the Washington Post, covering the sequential date as a recent social phenomenon--the sequential date as "cool." Other types of special calendar dates are featured on timeanddate.com. And for those interested in number sequences as intriguing mathematical tools, Victoria Jaggard's recent article at the Smithsonian Magazine site covers some of the basics. It even includes a quick and easy way to convert kilometer road signs into miles using the "Fibonacci sequence." But, of course, I really liked the cats holding the 1897 calendar best.
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