When is an embryo not an embryo? It's a question fit for a Zen master, but it's one that will have to be answered by federal bureaucrats, researchers and ethicists as biologists explore the weird ...

Scientists in Japan have coaxed mouse eggs to grow into apparently healthy mice without being fertilized first by sperm, marking the first creation of mammals from individual egg cells without any ...

Every Wednesday night, a chubby French biologist named Jean Rostand* sips a glass of cognac in a railroad cafe at Ville-d’Avray and plunges bravely but vainly into a village chess tournament. The rest ...