An example of a grad-school level question?
Which invention has technology that helps people keep food fresh for a long period of time?

An example of a grad-school level question?
Which most likely contributed to the extinction of many species and endangered the survival of others?

An example of a grad-school level question?
What safety equipment should be taken on all field trips?

An example of a grad-school level question?
A student pushes a wooden block across a sheet of sandpaper. Which characteristic of the block increases?