Studies in neuroscience with applications to humans offer clues about what makes us start eating, and when we stop.

Another update on the story we've been reporting on through the week - and M&S's payments meltdown goes from bad to worse as it has been forced to stop taking online orders. The chain has been ...

Drug A killed all the rats, mice and dogs. Drug B killed all the dogs and rats. Drug C killed all the mice and rats. Drug D was taken by all the animals up to huge doses with no ill effect.