The smartest kid in the class

The teacher asked her students if anyone knew the answer to 2+2, they had three tries or they would not get recess.

The first kid said “Uh, 14?

“No,” the teacher said.

The second kid said “3.8”

“Not quite” the teacher said.

Finally the third kid said “That’s easy, 4”

“Yes, you all get recess now”.

At the playground the kids asked how did he know the answer and he said “It’s all about the Kidneys!” as he pointed to his head.