Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: Pressure and vibration are examples of physical type of stimuli.
[A]: Pressure and vibration are examples of what type of stimuli?

[Q]: Half-life property of carbon and other elements can be used to date fossils and rocks, among other things.
[A]: What property of carbon and other elements can be used to date fossils and rocks, among other things?

[Q]: Millibar is the unit used to measure air pressure.
[A]:
What is the unit used to measure air pressure?