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Living Methuselah Trees Record Event
Nova Transcripts, via PBS

One summer it was so cold that it left you scarred for life. The few cells that grew that year were damaged when the water inside froze up, expanded and burst the cell walls. Tree rings were examined under a microscope. The jagged black line clearly showed cell death in the year 1627 B.C. What could have caused temperatures in that year to fall so dramatically? Could tree rings be a record of some cataclysmic event in another part of the world?

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