Astrotwins by Mark Kelly

The curious twins, Mark and Scott, get in big trouble when they take apart their dad's calculator.  When they get sent to their grandfather's house, their grandpa tells them to do something constructive with all their energy.  The twins decide to do something crazy for this "little" project.  They decide to build a rocket, but the only question this team can't answer is, who will go into space.  This book is written by a retired astronaut.  If you want to find out who in this team will get launched into space, read the book!
                                                                             

Click here to buy the book!