Biological sex is neither binary nor a spectrum – a biologist explains how it’s multidimensional

Each person is a mosaic of sex-related and postpubertal biological traits that vary in their degree of femaleness and maleness.
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Sudan's last breath: The final male white rhino, a monument to our shame

You’ve heard the name, but do you know the story? This isn't just about an animal. It's about a crushing symbol of humanity’s ...