The class A-1and 1-B is giving a tour of a laboratory by a scientific. They walk past some experience, the scientific stop to in front of it.

Scientific: "This is all out experience. Number 102, 103, 104, 105, 106 and 107."

He taps the glass of each tank and say their names as he talk. He makes sign to follow him again, when Midoriya raises his hand.

Midoriya: "I think you forget one." Point at the tank of 101.

(You are this experimentation.)