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refutation of his assumptions, Kelvin tightened the screws: “We now have good
reason for judging that it was more than 20 and less than 40 million years ago; and
probably much nearer 20 than 40” (20). But he could go even further, endorsing
King's estimate of 24 million years (21).
FIGURE 1
. Lord Kelvin in old age.
Source
: Gift of A. Rex Rivolo, courtesy AIP Emilio Segre
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