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  1. Humans

    From the July 5, 1930, issue

    POWER PLANT SENTINELS When hundreds of thousands of horsepower traveling with the speed of lightning are instantly halted, you may be sure there will be a grand disturbance. And there is, but all the fuss is confined in steel tanks 25 feet tall and 10 feet wide, filled with oil. Two such tanks are shown […]

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  2. Classic Body

    As part of an effort to put great works of fiction and nonfiction on the Web, Bartleby.com now presents the classic medical textbook Henry Gray’s Anatomy of the Human Body in all its searchable glory. The electronic version of the 1918 edition features 1,247vibrant engravings, many in color, as well as a subject index with […]

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  3. Math

    Möbius and his Band

    Making a Möbius strip.