Materials: Piece of paper (8 1/2″ X 11″), 4 playing cards, clothespin, piece of yarn, 2 batteries, small magnet (or any little object such as a button), 5″ masking tape
Problem: You have 2 minutes to think and 5 to respond. You have to build a little object that can carry the magnet (small object) with touching the magnet. You get points as to how many feet you can pull it.