Janice Sellers, a professional genealogist in Gresham, Oregon, has studied her family’s history for decades, and she’s uncovered a few twists along the way. In 2016, genetic testing revealed that her ...

The arrival of agriculture coincided with a sharp rise in a gene variant that protected against the virus that causes winter ...

These DNA changes, known as somatic mutations, happen naturally with age and are mostly harmless. However, some mutations give cells a growth advantage, meaning they can clone cells with the same ...