An example of a grad-school level question?
Which two activities use most of the water used in an average U.S. household?

An example of a grad-school level question?
If you breathe on a mirror, part of the mirror clouds up. What are you actually seeing when you see the mirror cloud up?

An example of a grad-school level question?
Which human trait is most likely inherited from a parent?

An example of a grad-school level question?
Which is the best way a science student can help to maintain laboratory equipment?