For the first time, scientists said Thursday that they had bred mice with two genetic fathers, steering around biological hurdles that would otherwise prevent same-sex parents from having offspring.

Vegetative reproduction from stems, roots and leaves is common to all plants and results in an identical plant from which the cutting came; it’s a clone. As gardeners, we propagate cuttings for many ...

Blood-forming stem cells are able to count and store memories of the number of times that they divide, findings which could have major implications for disease research, scientists have found.