Slade Suzanne
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English
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Biography of NASA mathematician Katherine Johnson.
Shares the story of the pioneering African American mathematician, Katherine Johnson, who helped calculate America's first manned flight into space, its first manned orbit of Earth, and the world's first trip to the moon.
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English
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"Grassland ecosystems can be found on nearly every continent. Countless animals and plants live in them. So what difference could the loss of one animal species make? Follow the chain reaction, and discover how important bees are."-- Back cover.