The scientists were playing hide and seek in heaven. Einstein puts his hands on his eyes and starts counting. They all hide where they find hiding places, but only Newton takes a piece of chalk and draws on the ground a square with the side of 1 meter and then sits in the middle of it.
After finishing counting, Einstein turns and sees Newton.
“I saw you ! You are Newton.”
Newton: “I’m sorry, but I’m not Newton”.
Einstein: “What do you mean you are not Newton ? I know you very well. You are Newton !
Newton: “Watch more closely. What do you see ?”
Einstein: “You are in the middle of a square with the side of 1 meter”.
Newton: “And what does it mean Newton per square meter ?”
Newton: “Do you understand now ? I’m not Newton. I’m Pascal.”