Abstract
GEOCHEMISTRYRadioactive decay--the pacemaker of geologic time--can no longer be called precisely clocklike. In the 15 September issue of Earth and Planetary Science Letters , a geochemist reports that the decay rate of beryllium-7 varies, depending on its chemical form. The variations seen so far are much too small, just a percentage or so, to affect Earth's overall time scale. Still, the variability in beryllium decay will prompt those who want to trace out fine divisions in the earliest reaches of time to take a close look at their pacemakers.
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