An example of a grad-school level question?
An Italian scientist named Alessandro Volta invented the Voltaic pile in 1800. It was able to produce a steady electrical current. Based on this description, what is the modern equivalent of the Voltaic pile?

An example of a grad-school level question?
Sleet and hail are forms of

An example of a grad-school level question?
Juvenile diabetes is a disease caused by the body's inability to create insulin. The body's white blood cells attack the pancreatic cells that produce insulin. This type of disease is known as

An example of a grad-school level question?
Which is the most basic unit of living things?