a: molecular clock ~
b: atomic clock


"So we don't know which one will be fixed. We do know how many will be fixed. So this is why the molecular clock is like an atomic clock; it's driven by radioactive decay. We don't know how many atoms--we don't know which atom will decay, but in a second we know how many will, for a given radioactive substance."

Writer: Professor Stephen Stearns
Date: Mar 18 2017 6:52 PM

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