An example of a grad-school level question?
A lunar eclipse occurs when the Moon passes through Earth's shadow. A lunar eclipse can only occur during a

An example of a grad-school level question?
Which physical property is important to have in a material used in cookware?

An example of a grad-school level question?
In which example could a thermometer be used to show that heat energy is being transferred?

An example of a grad-school level question?
A complete fossil has been found of a type of bird that cannot be identified. What can most likely be determined about the bird from the fossil?