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The Mayan Periodic Table of Elements, named for its similarity to the ancient Mesoamerican calendar, is based on electron shells. The shells are shown as concentric circles. Each row in the tabular form is shown as a ring. From the Database of Periodic Tables

The Aztec Calendar Stone was carved from solidified lava in the late 15th century. It somehow got lost for 300 years and was found in 1790, buried under the zocalo...