An example of a grad-school level question?
Students made lemonade using the following recipe: 100 grams of lemon juice 100 grams of sugar 1,000 grams of water The students combined the lemon juice, sugar, and water in a container. They stirred the lemonade until all the sugar dissolved. They poured the lemonade into a plastic tray and put the tray in a freezer. The next day, the students removed the tray from the freezer and observed that the lemonade was a solid. What is the mass of the solid lemonade?

An example of a grad-school level question?
Which function makes a plant cell different from an animal cell?

An example of a grad-school level question?
When a baby shakes a rattle, it makes a noise. Which form of energy was changed to sound energy?

An example of a grad-school level question?

Scientists who disagree with the results of an experiment should