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Firestick Farming - 08/26/2011
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Apsidal Precession (Perihelion Precession) and Milankovitch Cycles - 08/26/2011
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What Causes Precession and Other Orbital Changes - 08/26/2011
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Precession Causing Perihelion to Happen Later - 08/26/2011
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Are Southern Hemisphere Seasons More Severe? - 08/26/2011
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Milankovitch Cycles Precession and Obliquity - 08/26/2011
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How Earth's Tilt Causes Seasons - 08/26/2011
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Seasons Aren't Dictated by Closeness to Sun - 08/26/2011
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Introduction to Light - 08/26/2011
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Development of Agrilculture and Writing - 08/26/2011
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Correction Calendar Notation - 08/26/2011
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Understanding Calendar Notation - 08/26/2011
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Human Evolution Overview - 08/26/2011
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Detectable Civilizations in our Galaxy 5 - 08/26/2011
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Detectable Civilizations in our Galaxy 4 - 08/26/2011
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Detectable Civilizations in our Galaxy 3 - 08/26/2011
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Detectable Civilizations in our Galaxy 2 - 08/26/2011
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Detectable Civilizations in our Galaxy 1 - 08/26/2011
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Scale of the Small - 08/26/2011
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Scale of the Large - 08/26/2011
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