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How to Make Charcoal
Posted 8 years ago by ditter in category: interesting   Comments (4)

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How A Wind Powered Sawmill Works
Posted 8 years ago by catzbillner in category: interesting   Comments (0)

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The "guy who learns stuff" tackles the Backwards bike
Smarter Every Day challenge
Posted 8 years ago by HappyHour in category: interesting   Comments (3)

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Does cold water clean dirty dishes?
Dr. Karl
Posted 8 years ago by algoritmo in category: interesting   Comments (0)

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Indestructible Coating?!
Posted 7 years ago by boyt in category: interesting   Comments (0)