How Does a Worm Smell?

"What does it mean for a worm to behave what tell us some behaviors that they can show? What tricks can they do?" "I would go down to the m i t stock room, and i would just buy whatever random chemicals were there. And the worms could detect half of them, and they liked some of them and they didn't like some of them," he says. 'It was like this kind of giants tool box to start to walk into the nerves the worm's brain'