The world’s dead geniuses play hide and seek in heaven. Einstein goes over to a tree to count, while everyone scurry around to hide. In the meantime, Newton draws a 1 meter square with a stick and sits in the middle of it.

When Einstein finishes counting, he turns around and sees Newton in his square. “I’ve found you”, he says. “No you didn’t”, Newton answers. “But you’re right here in front of me!” Einstein says, puzzled. “Tell me, what do you see?” Newton asks. “I see you, Newton, sitting in a one meter square.”

“And what is a Newton on a 1 meter square?”

“A pascal.”

Newton grins.