A fifth grade science teacher began her class one morning. "Yesterday we talked about the formula for water," she said, "Which is...?" she scanned the room for an answer.
Billy's hand went up. "Billy?" she asked. Billy answered "H20."
"Very good, Billy." the teacher said. "Now, who can tell me the formula for ice?" She scanned the room again.
Wayne's hand went up. "Wayne?"
Wayne replied, "The formula for ice is H2O cubed!"