Question: Cold and dark, I'm the same as my neighbor. Flatter than a pancake, faster than a panther. Lighter than a feather I still prevail, Yet a million mean trying to lift me would fail. Expanding and shrinking throughout the day, When heat is highest, underneath I lay. I leave in the darkness of the night, And don't come back if there's rain in sight. What am I?
Answer: A shadow.