Being treated decently, it turns out, causes people's oxytocin levels to go up, which in turn prompts them to behave more decently, while experimental subjects given an artificial oxytocin boost - by means of an inhaler - behave more generously and trustingly. And it's not solely because of its effects on humans that oxytocin is known as "the cuddle hormone": for example, male meadow voles, normally roguishly promiscuous in their interactions with female