appendix:
1. Finger length ratio research is a relatively popular research field. But in fact, the controversy is also quite big -
Claude Desplan, a biologist at New York University, once said in an interview with the media, "Male hormones represented by testosterone may affect the ratio of finger length, but our brains do not just get male hormones during pregnancy." ”
But some people think it's OKAY, nora Charles, a researcher at the University of Texas Health Science Center, believes that "this is a new tool, there is a lot of controversy in the field of research, many scientists think it is useful, but some are still skeptical," she said, "But isn't the nature of science that is controversial?" ”
2, this experimental sample is relatively small, is 18 pairs of female twins and 14 pairs of male twins, mainly one likes boys, one likes girls of the same-born twins, it is not easy to find, so as to exclude genetic factors.
By the way, boys don't have to substitute themselves when they see this, and this study also had a male sample, but found no significant differences in men.
The 2010 analysis summarized the research data of previous generations, including 1618 heterosexual men / 1693 heterosexual women / 1503 non-heterosexual men / 1014 non-heterosexual women, and found that heterosexual women, the finger length ratio of both hands is relatively high, that is, girls with longer ring fingers are more likely to like girls.
3, this is called the Trevers-Willard hypothesis: in the process of evolution, genes adopted a gambling investment policy: if the parents have a low income level, even if they give birth to a son, the probability of mating is not high; Therefore, simply bet that the offspring are daughters, and tilt resources to them in the womb, making it more developed and easy to produce offspring.
4, as for why I wrote such a long appendix, it is because of the last boy version, you said that I was blind, and I want to prove myself this time.
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