Rats live longer when they are always a little hungry. She was a human animal. She was kept in an otherwise empty white room. It had no windows and the walls were indistinguishable from the floor and ceiling. She was kept there because she did not choose to stay there. She did not know how she had gotten there. It is uncertain if she was kept there, sometimes she felt like she might leave. She was given precisely such an amount to eat that she was always a little hungry. Even when she got used to the feeling, the feeling was still there. She lived to be very old, more than 50% older than the average female human animal.