Can you imagine a future where doctors are prescribing video games instead of drugs? It might be closer than you think. When used the right way, games can actually be good for you, training your brain to be stronger, faster, better. CNN's Dr. Sanjay Gupta investigates the science behind a new generation of games that can improve the speed of your visual processing, better harness your attention, and expand the depths of your memory. Plus, go inside the booming ultra-competitive world of eGaming and a first-of-its-kind Internet addiction treatment facility in China, the first country to declare this problem a "public health crisis."