instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The action of flushing the toilet, performed multiple times daily, is the single biggest use of water in the home.
answer:
What action, performed multiple times daily, is the single biggest use of water in the home?


question:
Thermosphere is the upper-most atmosphere.
answer:
What is the upper-most atmosphere known as?


question:
The light-sensing cells in the retina are called rods and cones.
answer:
The light-sensing cells in the retina are called rods and what else?