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Science 17 June 2005:
Vol. 308. no. 5729, pp. 1723 - 1724
DOI: 10.1126/science.308.5729.1723
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News of the Week

GEOCHEMISTRY:
New Geochemical Benchmark Changes Everything on Earth

Richard A. Kerr

More-precise measurements of the neodymium isotope composition of meteorites, published online this week by Science (www.sciencemag.org/cgi/content/abstract/1113634), show that geoscientists have been using an incorrect composition of the rocky Earth as a benchmark to infer everything from mantle compositions to the amount of interior heat being generated by radioactive decay.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)