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

[EX Q]: Over 90% of the energy we use comes originally from the sun.
[EX A]: Over 90% of the energy we use comes originally from what?

[EX Q]: Low specific heat does a metal spoon heat up quickly when placed in a hot drink.
[EX A]: Why does a metal spoon heat up quickly when placed in a hot drink?

[EX Q]: Frequency factor is used to convert concentrations to collisions per second.
[EX A]:
What is used to convert concentrations to collisions per second?