One of the rats is in Brazil, and the other is in the United States. Even at this great distance, neuroscientists have been able to create a new central nervous system out of two brains. This is the first step towards building an organic computer that uses a network of linked animal brains to solve tasks.
They way they tested follow: They taught one of the rats to press a lever. Then, the other would be prompted to press the same lever. If it did, they would both get a reward. So far their success rate has been 64%. Not significant, but greater than a 50/50 chance.
Some, however, are skeptical that they haven't achieved anything beyond a 'Hollywood blockbuster' pseudo-science. Read more at the source.