A third grade teacher asks her class if they could have one mineral in the world, what would it be?

Johnny raises his hand and says, "Teacher, if I could have one mineral in the world it would be gold!"

"And why is that?" asks the teacher.

"Because its really expensive and I could buy me a Corvette with it!"

"Okay," says the teacher, "that's fine. Susie, how about you?"

"Well, teacher, I would choose platinum because its more expensive than gold and I could buy myself a Porsche."

Little Billy then raises his hand.

"Yes, Billy, what mineral would you choose?"

"Silicone!" Billy exclaims.

"Silicone?" the teacher asks, "why silicone?"

"Because my mom has a lot of it and she has a Corvette and a Porsche!"