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500-million-year-old “squid” were actually ferocious worms

A stunning discovery in North Greenland has reclassified strange squid-like fossils, revealing that nectocaridids were not early cephalopods but ancestors of arrow worms. Preserved nervous systems and unique anatomical features provided the breakthrough, showing these creatures once ruled as stealthy predators of the Cambrian seas. With complex eyes, streamlined bodies,...

Extinct human relatives left a genetic gift that helped people thrive in the Americas

Scientists have discovered that a gene called MUC19, inherited from Denisovans through ancient interbreeding, may have played a vital role in helping Indigenous ancestors adapt as they migrated into the Americas. Found at unusually high frequencies in both modern and ancient populations, the gene likely provided immune advantages against new...