Neurotransmitters are highly important and mind-bendingly complex. That’s why now and then I hip-check writers who boil neurotransmitters down to simple stories. Neurotransmitters are multi-purpose messengers. They’re versatile enough, in fact, to get hijacked by parasitic worms who use them to enslave perfectly innocent shrimplike creatures called gammarids. As Carl Zimmer relates, in Parasites Use […]