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10/13/2007
Which Was Invented First - The Telephone Or The Radio?
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10/3/2006
Who Invented Houses?
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3/18/2009
What Are The Differences Between A Light And Electron Microscope?
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11/21/2008
Why Was Paper Invented?
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7/23/2009
Who Discovered Keyboard?
Anonymous
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12/12/2006
How Does Archimedes Screw Work?
Anonymous
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1/24/2007
When Was Methadone Invented?
Anonymous
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2/22/2007
Who Invented High Heels And Why?
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4/10/2007
How Does A Piston Pump Work?
Anonymous
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3/26/2007
How Was Paper Invented And Who Made It?
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9/6/2006
Where Was Margarine Invented And When?
Anonymous
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6/27/2009
Who Invented The Light Pen?
Kathy Castillo
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2/1/2007
Who Invented The First Video Game?
Anonymous
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3/22/2007
When Was Gunpowder Invented?
Anonymous
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1/18/2007
Who Invented The Electric Chair?
Anonymous
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10/23/2006
Who Invented Dynamite?
Anonymous
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1/28/2007
Who Invented Calculus?
Anonymous
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10/2/2006
Who Invented Gas Lighting?
Anonymous
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6/11/2009
Who Is Clara Y. Lim-sylianco?
Anonymous
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3/13/2007
What Is A Lever?
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