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Source:
Technology and Engineering Teacher. May-June, 2020, Vol. 79 Issue 8, p42, 2 p.
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National Parks. Winter, 2019, Vol. 94 Issue 1, p10, 3 p.
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American Scientist. July-August, 2003, Vol. 91 Issue 4, p359, 1 p.
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The Science Teacher. February, 2020, Vol. 87 Issue 6, p57, 6 p.
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Science. September 5, 1997, Vol. 277 Issue 5331, p1444, 2 p.
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