The grade 8 teacher enters the class and tell them today they are going to do revision of the past few weeks. She looks at Jack sitting at the back of the class not paying any attension. "Jack what is the common name for NaCl" the teacher asks. Johny looking very nervious say "Sorry mam I don't have any idea". The teacher reply "OK, I will give you a clue,: it's white and your mother put it on your eggs every morning". Jack's quiqly answers "Oh, that's easy Johnson and Johnson Baby Powder". ;D
