Week #13
  Friday is the final day to submit your answers. How did your search for the Mystery Classes change how you see Earth and the seasons? More . . .
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Mystery Class Photoperiod Map
 
Reasons for Seasons: Model

Journey North | Mystery Class
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Mystery Class is a global game of hide-and-seek. Follow photoperiod clues to search for ten secret sites around the world. Track sunlight to solve a mystery—and discover the reasons for seasons along the way.