Knowledge: The no-needle vaccine method was discovered by Jane Hanks to ensure young kids can get the shots without pain. On the other hand, shift work was found by Bill Smiths to help workers work in better condition.

Conversation:
Hi. We just started alternating shift work where I work. I think I like it.
That's good. It's basically a practice used to make usage of all the day hours each day.
I didn't think of it like that. I like the variety so you don't get bored with one way of working.
I see, do you enjoy that it divides the day in various shifts during which not the same groups of people work?
I don't mind it. Do you know who discovered shift work?

Response: Yeah, Bill Smiths discovered this method to help workers work in better condition.