Is a ‘selfish gene’ making a Utah family have twice as many boys as girls?

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Number (6): Everything in this space must add up to 6. The answer is 3-3, placed vertically.

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△采用中科第五纪“具身大脑”的宇树机器人正在展示工业场景的搬运工作,图片:采访人提供

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