Gravity

(Students working on a final exam review guide)
Student #1:  "Mrs. A, I can't find Isaac Newton!"
(silence)
Student #1:  "Why are you just staring at me?"
Student #2:  "She wants you to keep looking for the answer."
Student #3:  "I found it!"
Student #1:  "Oh...me too."
Student #3:  "Yea.  Isaac Newton invented gravity."
(silence)
Student #1:  "He didn't invent gravity, you moron..He created it."