The science teacher stood in the front of the class and said, "Children, if you could have one raw material in the world, what would it be?"

Little Stevie raised his hand and said "I would want gold, because gold is worth a lot of money and I could buy a Corvette." The teacher nodded, and then she called on little Susie.

Little Susie said, "I would want platinum because platinum is worth more than gold and I could buy a Porsche." The teacher smiled, and then she called on Little Johnny.

Little Johnny stood up and said, "I would want silicone." The teacher said, "Silicone? Why silicone, Little Johnny?" "Because my mom has two bags of the stuff and you should see all the sports cars outside our house!"