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RichardKennaway comments on [LINK] The half-life of a fact - Less Wrong Discussion
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That's how it was. Atomic weights were known to be not in whole number ratios, although sometimes tantalisingly close to them, and a lot of effort went into determining them precisely. There was a certain amount of chagrin when scientists realised that these numbers had no fundamental significance, but were just the average weights of the distribution of the different isotopes.