Temperatures are dropping, and that tiny mouse in the house looms large as pests make their way inside. Here's how to keep ...

What does it feel like to be a rat? We will never know, but some very unusual mice may now have an inkling. In a series of new experiments, bits of rat brain grew inside the brains of mice. Donor stem ...

Chimeras, fictional creatures made up of a combination of body parts from different animals, such as the mythological Minotaur, have captivated thinkers, philosophers and scientists throughout history ...

To create mouse-rat "chimeras," researchers injected rat stem cells into mouse embryos that lacked some genes for brain development. Creative Touch Imaging Ltd. / NurPhoto via Getty Images Scientists ...