Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[Q]: Question: What form does formaldehyde take at room temperature? Answer: gas
[A]: Formaldehyde is a gas at room temperature. Acetaldehyde boils at 20C; in an open vessel, it boils away in a warm room. Most other common aldehydes are liquids at room temperature.

[Q]: Question: What word describes a change in behavior that occurs as a result of experience? Answer: learning
[A]: Learning is a change in behavior that occurs as a result of experience.

[Q]: Question: When waves of two different frequencies interfere, what phenomenon occurs? Answer: beating
[A]:
When waves of two different frequencies interfere, a phenomenon known as beating occurs. The frequency of a beat is the difference of the two frequencies.