RT @JayMan471: Every time I see a birth order effect study, I wonder if they stu

RT @JayMan471: Every time I see a birth order effect study, I wonder if they studied only full siblings. Half-sib effects might explain any…


Source date (UTC): 2023-01-29 13:08:02 UTC

Original post: https://twitter.com/i/web/status/1619683791605493760

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