Scientists have created a Frankenstein mouse with a part-rat brain

Scientists have created a rodent Frankenstein. 

In two new studies, researchers from Columbia University and the University of Texas Southwestern have revealed that rat brain cells can fill in for lost neurons in mice. 

When they put together rat and mouse brains, they found that the rat brain cells helped the mouse to better understand its environment, and even allowed mice to sniff out sweets. 

Dr Kirstin Baldwin...