Add 'Reference Sources'

Reference Sources

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+Am thinking with each level Players should a set of references, documents to read and get some background of the objective in the level.
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+along with the tech tree we can associate the references to help guide kids do some of the serious readings outside the game.
+this is specific to the impossible Inc academy only. If we have a bank of of these, we can randomly match the content base to the reading material. In our meeting tomorrow we should try to see if we can have the expert  categorize the resources 
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+https://en.wikipedia.org/wiki/Moon_Shot
+https://en.wikipedia.org/wiki/Mercury_Seven
+https://en.wikipedia.org/wiki/History_of_SpaceX
+https://en.wikipedia.org/wiki/Mars_Orbiter_Mission
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