In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

[EX Q]: Question: I use a knife to chip away at what to make a sculpture? Answer: A slab of rock.
[EX A]: scraping an object may cause small particles to break off of that object

[EX Q]: Question: Which season is it for Australians in July? Answer: Winter.
[EX A]: seasons cause change to the environment

[EX Q]: Question: What is essential for a robot to possess to walk up a flight of stairs? Answer: electricity.
[EX A]:
a computer controls a robot