There is no 'why', there is just Science... and death rays! Applied Science is a class-based FPS designed around mad scientists and their zany experiments. Choose from an Atomic Physicist that can deploy a bullet-halting time field, A chemist with a poisonous gas problem or a Particle Physicist with a disposition for teleporting.
This game is awesome! It's team fortress but with mad scientists! I love how its all different, like instead of just having a shield that bullets hit, it just stops them in mid air, then releases them after a certain time. And the portals are awesome fun. Overall great game, I want more maps!