University of Pennsylvania swimmer Lia Thomas is only the most recent and most visible example of biological men competing and winning against female athletes, with examples now dating back several ...

Believe it or not, your chronological age (the amount of years you’ve been on earth) and your biological age are two very different things. Put simply: Even if two people are 45 years old, they are ...

A 3D graphic showing an artist's interpretation of human X and Y chromosomes. On the left are blue bundles of genetic material making an X shape and on the right blue bundles of genetic material ...

This is the second in a series of posts about my book, The Four Realms of Existence. Source: Harvard University Press/Used with permission The world we live in is filled with things that we ...