The scientific studies proving that animals are more like us than many thought keep on coming. The latest shows that a rat will go out of her way to free a caged stranger. If there is a pile of chocolate chips (which rats love) sitting nearby, a rat will rescue the caged rodent before eating the candy and then will share it with the stranger. Far from running entirely on instinct, rats demonstrate compassion and generosity even when they stand to gain nothing. Actually, this may not show that rats are just like humans — in some cases they may be more moral than some of us.