A man was near death in the hospital, so he called his three sons. He gave them equal money, and asked them to fill up their living room entirely with something. Whichever son was successful would receive their father’s entire inheritance.
The first son bought sticks, and tried to fill the room entirely before he ran out. The second son bought straw, but once again, he ran out before entirely filling the entire room. The third son bought only two things, and was able to successfully fill the entire room and received the inheritance.
What did the third son buy, and how did he fill the room?