Topics to research for a science fair project?

parallel universes....this guy on nova aimed a laser beam towards two holes in cardboard against a black backdrop. You would think that the laser beam would split up into 2 beams through both the holes and end up being two spots on the board on the other side. But what happens is that there are all kinds of spots that show up when you shine a laser beam (one laser) through two holes that are vertically on a piece of cardboard. google nova or pbs and parallel universes... watc