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

Ex Input:
The name of film that polyester fibers form is mylar.

Ex Output:
What is the name of film that polyester fibers form?

Ex Input:
Zero is the net force acting on an object when two equal forces are applied from opposite directions.

Ex Output:
What is the net force acting on an object when two equal forces are applied from opposite directions?

Ex Input:
You call a pure substance that cannot be broken down into different types of substances a(n) element.

Ex Output:
What do you call a pure substance that cannot be broken down into different types of substances?