Darwin
Darwin :
A logarithmic unit measuring the rate of evolution in characteristics of organisms. If the measurement of a characteristic (such as length, for example) changes from a to b in y million years, then the rate of evolution is (ln b - ln a)/ydarwins. (Technically, since the difference in natural logarithms is dimensionless, the darwin is a specialized name for the inverse megayear Ma-1). The unit is named for Charles Darwin (1809-1882), the English biologist who founded the theory of evolution
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