How do we know when our interpretation is wrong?

Just skimming through the article gave me irony overload.

The very same thing could be said of evolution and old earth geology. There are absolutely amazing predictions that the theory of evolution makes, such as predicting the pattern of differences between the human and chimp genomes:

In geology, we can predict the ratio of 238U/206Pb in zircons by measuring the ratio of 235U/207Pb. The ratios won’t be the same, by the way. Instead, we can use the observed and measured decay constant for each U isotope to make those predictions. If those decay chains acting at those rates did not produce those ratios, then how are we able to so accurately predict what those ratios will be?

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