An example of a grad-school level question?
When water evaporates from Earth's surface into the atmosphere, its molecules enter the gas state. What change in this gas causes molecules to condense into the small water droplets that form clouds?

An example of a grad-school level question?
Which sense is used to tell if there is sugar in a glass of tea?

An example of a grad-school level question?
Visible light is which type of wave?

An example of a grad-school level question?
A dragonfly develops through incomplete metamorphosis. Which stages does the dragonfly's life cycle include?