He found that children of rats that had learned the maze were able to run it faster--the first rats would get it wrong 165 times before being able to run it perfectly each time, but after a few generations it was down to 20.
Children of rats were able to run it faster. These rats had learned the maze. He found this. The first rats would get it wrong 165 times before being able to run it perfectly each time. It was down to 20. This was after a few generations.