There was a very rich man named Mike. In his house, he had a very large room. "If anyone can fill my room in one day, I will give him 20,000 dollars." he said. Everyone in the town wanted to have a try.
Mark tried to fill the room with stones. At the end of the day, he was very tired, but the room was still not full.
Martin tried to fill the room with wood. He worked all day, but the room was not full. "That room is too big, no one can do this." he said.
Alan said, "I can do it. It's easy." Everyone laughed. They thought he could not do it. Then, he went to the park and played all day. His friend asked him, "Why are you playing, you should be working." The man said, "Don't worry." At 8:00 at night, the man came to the room with a small bag. The rich man said, "That bag is too small. How will you fill the room?" The man took a candle out of the bag. He lit the candle and said, "You see, the whole room is filled with light!"