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pastranus: 400 years
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pastranus: Galileo different weights
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pastranus: Galileo's telescope
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pastranus: rayuela de kepler
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pastranus: DSCN2932
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pastranus: DSCN2931
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pastranus: DSCN2927
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pastranus: DSCN2925
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pastranus: niños y pastrana en rayuela de kepler
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pastranus: Hopscotch of Kepler