evidence: University of Pennsylvania swimmer Lia Thomas, who has become central to the debate about transgender inclusion in competitive women’s sports, lost a race Saturday to Iszac Henig, a trans male swimmer at Yale University who swims on the women’s team. [...] Though Thomas managed to win two events Saturday, she came in sixth in the 100-yard freestyle after competing head-to-head against Henig, a junior at Yale. Henig is eligible to compete on the women’s team as a trans man because he’s chosen not to receive gender-affirming hormones, also known as hormone replacement therapy, such as testosterone. [...] The NCAA guidance is similar for trans female athletes like Thomas, though it requires that trans women receive testosterone suppression treatment for at least one year in order to compete on women’s teams.