What question did this study set out to answer?

To assess whether the charge of the proton has varied significantly during Earth's history.

Time Variation of the Charge of the Proton

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Analysis of nuclei suggests elementary charge variation is less than one part in 1600 over Earth's history, indicating stability.

To assess whether the charge of the proton has varied significantly during Earth's history.
Analyzed the terrestrial occurrence of the nuclei ${ ext{Re}}^{187}$ and ${ ext{Os}}^{187}$.
Utilized deduced relationships between these elements to estimate charge stability.
Determined that the charge of the proton cannot have varied by more than one part in 1600 during Earth's history.

Freeman J. Dyson (1967) studied this question.

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