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

Ex Input:
You call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission, superconductors.

Ex Output:
What do you call materials able to conduct electricity with 100% efficiency, meaning that no energy is lost during the electrical transmission?


Ex Input:
Endoscopes are used to explore the body through various orifices or minor incisions.

Ex Output:
Endoscopes are used to explore the body through various orifices or these?


Ex Input:
The atmosphere is the source of precipitation.

Ex Output:

What is the source of precipitation?