Scientists taught rats to drive to a certain destination, but the rodents took a detour, suggesting they enjoy both the journey and the rewarding destination.

Although cars made for rats are far from anything they would encounter in the wild, we believed that driving represented an interesting way to study how rodents acquire new skills. Unexpectedly, we found that the rats had an intense motivation for their driving training, often jumping into the car and revving the "lever engine" before their vehicle hit the road. Why was that?