From the time America began designing it's educational system we've known that kids learn better when they are active.  Being outdoors makes for good learning.  Unfortunately in the past 20 years there has been a steady decline in physical education and recess in American schools as there has been a steady incline towards testing scores and homework.  These are counter productive.

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Creating an environment where students can learn from their natural surroundings is far superior to an antisceptic classroom where they sit in hard desks and take notes all day.  The natural world makes for a fantastic classroom.