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I agree that some of the examples are a bit fluffy, but later in the article, they mention a much stronger study! They cite an example of high school students being split into a control and treatment group for tutoring students with a clearly observable output based on biological data.

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It's "strong" in that you can see some effect in blood of people tutoring vs people waiting. But that's about it, you can't draw other conclusions from it. It says absolutely nothing about volunteering, health, being kind, etc.

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