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Science 6 October 2006:
Vol. 314. no. 5796, pp. 36 - 37
DOI: 10.1126/science.314.5796.36b
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News of the Week

GEOCHEMISTRY:
Has Lazy Mixing Spoiled the Primordial Stew?

Richard A. Kerr

Two isotopic studies published online by Science this week (www.sciencemag.org/cgi/content/abstract/1131708 and www.sciencemag.org/cgi/content/abstract/1132595) indicate that the notion of permanent layering in Earth's depths, first published last year, may rest on shaky assumptions about the chemistry of the early solar system. (Read more.)

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