Thomas edison was afraid of dark.

This is an ironic play on words that's technically false. Thomas Edison, who invented the light bulb, was not afraid of the dark. He was actually afraid of the lack of being able to see and work, which is different. The joke plays on the contradiction that the "man who invented light" would fear darkness. Edison was known for working long hours and was driven by innovation, not superstition or fear of darkness. This is more of a trick question than a factual inquiry.