SimpleRockets is free today for reddit cakeday (whatever that means) so grab it now while it’s free. Regularly $1.99, this app will appeal to all those aspiring rocket scientists out there. I studied the “training” manual with my son and it’s not only fun, it’s educational. I have had a much more difficult time finding educational apps that appeal to my older child and this one definitely fits the bill. Players can build their own rockets, launch them and then explore the solar system. Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.