“Some scientists were conducting an experiment, he said, trying to gauge the impact of abuse on children. Ducks, like people, develop bonds between mother and young. They call it imprinting. So the scientists set out to test how that imprint bond would be affected by abuse.

The control group was a real mother duck and her ducklings. For the experimental group, the scientist used a mechanical duck they had created - feathers, sound, and all - which would, at timed intervals, peck the ducklings with its mechanical beak. A painful peck, one a real duck would not give.

They varied these groups. Each group was pecked with a different level of frequency. And then they watched the ducklings grow and imprint bond with their mother.

Over time, he went on, the ducklings in the control group would waddle along behind their mother. But as they grew, there would be more distance between them. They'd wander and explore.

The ducklings with the pecking mechanical mother, though, followed much more closely. Even the scientists were stunned to discover that the group that bonded and followed most closely was the one that had been pecked repeatedly with the greatest frequency. The more the ducklings were pecked and abused, the more closely they followed. The scientist repeated the experiment and got the same results.”