From Collected Thoughts (But I’m fairly certain this is an excerpt from Surely You’re Joking Mr. Feynman)
One day, two or three of the young rabbis came to me and said, “We realize that we can’t study to be rabbis in the modern world without knowing something about science, so we’d like to ask you some questions.”
Of course there are thousands of places to find out about science, and Columbia University was right near there, but I wanted to know what kinds of questions they were interested in.
They said, “Well, for instance, is electricity fire?”
“No,” I said, “but… what is the problem?”
They said, “In the Talmud it says you’re not supposed to make fire on a Saturday, so our question is, can we use electrical things on Saturdays?”
I was shocked. They weren’t interested in science at all! The only way science was influencing their lives was so they might be able to interpret better the Talmud! They weren’t interested in the world outside, in natural phenomena; they were only interested in resolving some question brought up in the Talmud.
And then one day- I guess it was a Saturday- I want to go up in the elevator, and there’s a guy standing near the elevator. The elevator comes, I go in, and he goes in with me. I say, “Which floor?” and my hand’s ready to push one of the buttons.
“No, no!” he says, “I’m supposed to push the buttons for you.”
“Yes! The boys here can’t push the buttons on Saturday, so I have to do it for them. You see, I’m not Jewish, so it’s all right for me to push the buttons. I stand near the elevator, and they tell me what floor, and I push the button for them.”
Well, this really bothered me, so I decided to trap the students in a logical discussion. I had been brought up in a Jewish home, so I knew the kind of nitpicking logic to use, and I thought, “Here’s fun!”