Science fair

The science fair is soon and I have a team but we don't know what we are going to make. Its really hard trying to think what to do, First we where going to make a phone cage we where going to make a cage put the phone in it so no one would play with it or delete your numbers. Then we where going to make off roller blades, we where going to get normal roller blades and change the wheels and put some springs on it. We didn't know how we where going to do it. So know we are thinking of a new thing to do.