Elevators move the equivalent of the world's population every 72 hours but how safe are they? Break It Down tests the strength of cable against the force of gravity with surprising results.
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"Every teacher at our school that has previewed your Animated Hero Classics Family Collection has raved about the product and requested that this c...
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Available with both English and Spanish Language and Audio. ThisåÊeducational videoåÊtells the story of the man referred to as "the father of the d...
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Available with both English and Spanish Language and Audio. Often referred to as the ‰ÛÏFather of modern astronomy,‰the ‰ÛÏFather of modern physic...
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Available with both English and Spanish Language and Audio. Marie Curie (November 7, 1867-July 4, 1934) was a Polish-French physicist and chemist. ...
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ncludes full, step-by-step solutions to all student textbook problem sets, final answers in bold type for accurate grading
