This image shows a mouse embryo.

Evolving a Bigger Brain with Human DNA

Researchers have shown it is possible to pick out key changes in genetic code between humans and chimpanzees. They were then able to visualize the contributions to early brain development using mouse embryos.
This image shows a top view of a mouse brain.

In a Battle of Brains, Bigger Isn’t Always Better

Bigger brains don't necessarily mean greater intelligence, at least in mice and rats, a new study reports. The findings could have major implications for the future of research into learning and behavior.