An aquifer is a body of water underground that can be tapped for a well or such, can be either confined or unconfined. An aquitard is a zone of rock that restricts the flow of groundwater from one aquifer to another.
"A wise man can learn more from a foolish question than a fool can learn from a wise answer." -Bruce Lee
When asked what his IQ was, Stephen Hawking said "I have no idea. People who boast about their IQ are losers"