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he oversaw an assortment of dangerous—even deadly—experiments
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Look Up!: Henrietta Leavitt, Pioneering Woman Astronomer Romance_Gift_Guide hints of witchcraftHenrietta Levitt was the first person to discover the scientific importance of a stars brightnessso why has no one heard of her? Learn all about a female pioneer of astronomy in this picture book biography. Henrietta Swan Leavitt was born on July 4, 1868, and she changed the course of astronomy when she was just twenty five years old. Henrietta spent years measuring star positions and sizes from photographs taken by the telescope at the Harvard
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