Free version: itunes.apple.com Full version:itunes.apple.com Song: Satisfaction by Benny Benassi Fission is a particle simulator for iPad, iPhone, and iPod touch. The app depicts an artistic view of molecular interaction in a nuclear fission reaction. Simply put particles explode and collide with additional particles starting a violent and colorful chain reaction. Appdictions.com – 5 Stars “Strangely satisfying and mesmerizing”