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Screws and screw heads simple machines
What is a simple machine?
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11 Banned Books Through Time
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10 Greatest Baseball Players of All Time
An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
11 Egyptian Gods and Goddesses

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William Sellers
American engineer and manufacturer