https://substack.davidepiffer.com/p/sex-and-fertility-across-a-millionPifferPilferen2026-10-16T14:30:26+00:00Reich’s new paper: Could humans interbreed after 1.2 million years apart?https://substack.davidepiffer.com/p/patience-and-the-pecking-orderPifferPilferen2026-10-15T14:03:02+00:00Patience and the Pecking Order