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Obsidian artifacts can record ancient climate
The layer of hydrated material that forms on the surface of ancient obsidian artifacts as they age can be used to estimate the temperatures that the artifacts have experienced.
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Did the researchers take into account that most arrow points and spearheads would have been in contact with the inside of game, a considerably warmer and more humid environment than the ground where the points were found? Daniel WoitulewiczDetroit, Mich. The material would be inside game—and at a higher temperature than the environment—for only a […]
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Blood clot protein is stretchiest natural fiber ever found
The protein that forms the backbone of blood clots can stretch to several times its own length and then snap back to its original size.
