Noah's Brick — Piers Anthony

11 year old Noah discovers a remarkable brick that has three holes on one side and four holes on the other side, all of the holes passing completely through it. How can this be? He knows others will think this is nonsense, but he is determined to find out the brick's secret. This leads to an alien space station -- Noah's Ark--and encounters with other young folk, such as Si, an abused 11 year old girl who also has an alien artifact. Maybe she will be his girlfriend, if she can ever learn to trust a boy. They discover special powers, and will form a project to save the world, using the alien technology.