Technology

Was watching a program "I, videogame" and it was interesting to note that video games were a by product of the Cold War. They were created on computers that were owned by the military used during the Cold War to perform computations and simulations.
I remember reading somewhere that microwaves were discovered by the military and were not originally used for cooking :p
On the topic of technology, can anyone tell me what this gadget is for? I will reveal the answer in a few days time.