Most of times, when people think about their future or how communication will have been improved in a few years, technology is always mentioned. At least for teenagers, this one is the most interesting subject to discuss, especially computers, which have been the most useful gadget for a XXI century teenager.
Nowadays, it's difficult to find a teenager who doesn't have a telephone or even more, a PC. Internet is used for all types of things. Playing games and talking with someone who is living across the world are typical actions of this grown-up kid. Not only "home computers" but crucially laptops have become more modern and practical.
When you don't know what life has in store for some economic problem, you can just imagine what will happen by clicking your mouse and searching on "Google". This means that ANY information or news that you would like know is found in this technological gadget!
So in this sense, you can improve your brain with all types of points of view about a subject. The computer is a miscellany of all planet knowledge.This means that, again, this gadget is the most useful for a XXI century teenager.