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20 years? .. erm, ok! Here are my guesses, may be not in 20 but this will eventually happen, may be in 3-4 decades.
We will be able to machine read human brain, and write too. Kind of install Engineering memory card and you are an Engineer, etc.
Overall brain interfacing will be quite common. Think of something, and robot/machine will do that. It can be a robotics arm, or stand-alone robot maid. (actually, this is partially done already)
Credit cards, ID cards, driving licenses and all similar stuff will be synchronized (is it right word?) with your finger prints, so you wont keep heavy wallet. Every time you want to pay at store, you will place your thumb and enter PIN and amount.
Intelligent mutually interacting cars will be on roads, they will continuously interacting with nearer cars and powerful computers will compute stuff to reduce accidents and increase automation. Aircraft kind of do this, already.
Some kind of wireless internet (may be, free) access will be available in every corner of the world.
Google will declare itself eGod. lol
Flying cars, as most of you know.
Space trips will get cheaper.
Alternative of oil? may be sun.
World will no longer remain unipolar.
A world war? lol ..
Kenyans will stop raping charity girls, may be.
etc.
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