Then he looked for commonalities: principles that could explain how things worked consistently, across all three buckets. In bucket 1 he found Newton’s Third Law of Motion: for every action, there is an equal and opposite reaction. In other words, the more force you exert on something, the more force that thing exerts back. In bucket 2 he found Mark Twain’s example of what happens if you pick up a cat by its tail: it will attack you. In bucket 3 he found something similar: how we treat other people is how they will treat us back. The commonality was a principle that he dubbed “mirrored
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