[33-34] Anyone who’s had a shady oyster or a mushroom soup that didn’t go down well remembers the ominous queasiness heralding impending bad times. Bacteria release toxins that start the body’s process of speedily evacuating the contents of the stomach.
It’s a protective mechanism of sorts—getting rid of the invaders en masse is probably helpful in the long term, even if it’s unpleasant in the short. But it has remained something of a mystery how the brain gets the alarm signal, then sends anoth...