On this special, 12-sided 2013 calendar, the Earth's 4.5 billion year history is compressed into 12 months, so fro example the Paleozoic period for example begins on November 19, while the Precambrian period is from January until mid November.
Download + build your own (Japanese) papercraft 2013 dodecahedron Earth's history calendar (+lots more, by Soilshop):
http://www.k4.dion.ne.jp/~soilshop/papeclaft_biohistorycalendar.html
(click the "型紙 >>> ２０１３年版型紙Ａ４×１枚(226kb)" link at the bottom)
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