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- Sweet Confusion: Does high fructose corn syrup deserve such a bad rap?
- Closed Thinking: Without scientific competition and open debate, much psychology research goes nowhere
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- A mind for math: A part of the brain associated with making memories may also predict success in learning math
- Teens take home science gold: A low-cost, self-driving vehicle; battery alternatives and analyses of galaxy clusters claim top prizes at a global high school science competition
- Flagging loose bolts: “Smart alert washer” automatically flags when a nut is coming loose, warning of potential danger
Web edition: November 16, 2012
Print edition: December 1, 2012; Vol.182 #11 (p. 4)
NEW DATING METHOD FOR MILLION-YEAR-OLD FOSSILS — A new radioactive dating method promises to close one of the major remaining gaps in methods of fixing dates on the geological and archaeological time scales. The new procedure, based on radioactive inequality in nature between uranium-234 and its parent U-238, was originated by David Turber of Columbia’s Lamont Geological Observatory at Palisades, N.Y. The research is described in the Journal of Geophysical Research, Nov. 1962. Uranium-234 is an isotope of uranium formed by the radioactive decay of U-238. The “disequilibrium” between the two isotopes possibly can be employed to date sedimentary material — which often contains fossils — as old as 1 million to 1.5 million years.
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