Good Riddles

Question: What is the difference between a locomotive engineer and a teacher?

Question: What did the calculator say to the Math student?

Question: you have two liquid substances in a sealed jar one yellow one white, they stay separate even when shaken. When poured out the white substance turns clear what am i?

Question: 1 is 3, 3 is 5, 5 is 4, 4 is perfect. Why?

Question: A wooden block is floated on water. What can be placed on it to reduce its weight?