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Alexander Telfar

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Daniel also understood that it was important to compare groups. In this respect he was already more sophisticated than many people today, who choose a fad diet (for example) just because a friend went on that diet and lost weight. If you choose a diet based only on one friend’s experience, you are essentially saying that you believe you are similar to your friend in all relevant details: age, heredity, home environment, previous diet, and so forth. That is a lot to assume.
The Book of Why: The New Science of Cause and Effect (Penguin Science)
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