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Jan. 10, 2018, 4:21 p.m.

Between the lines: Tree rings hold clues about a river's past

By analyzing centuries-old tree rings, researchers are extracting data about monthly streamflow trends from periods long before the early 1900s when recorded observations began. https://www.sciencedaily.com/releases/2018/01/180110101028.htm

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An acoustic listening device used by the Dutch army for hearing enemy airplanes, between World War I and II.
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