Matrix

science fiction taken to a new level....
most of people think this is just a fiction out of someone's mind and cannot be realized and movie is just a good action movie.
but i strongly believe in the concept and that it can be put to reality one day.

first bottleneck to it realization is the communication between human brain and a machine.
I am listing this as first as human brain is the most complex thing to understand. how brain is interacting with all parts of body and within the brain itself, which signal goes for performing all the actions of body and signal itself: a neural signal, how to capture it and in turn simulate it. and these signals will not be generic across all being i.e. different people can have different signals for same action.
however, this problem will be solved if people remain all the time in matrix. we will have a set of signals for a set of actions and brain will eventually leans to map agains proper set.
well some sort of these solutions are already there, we can capture the waves (EM etc. coming from brain)

next bottleneck will be the processing of all that data. we need to put all the laws of physics in the matrix and based on actions, reactions will take place. this looks to be easy writing a program for same once but good processing power is required for realtime processing of all the events. it cannot be the case that i am cutting an apple and it appears to be cut after a delay becoz processor was not able to process my request at that time.
then we have to generate real time 3D visuals for all the current scenes from all angles n people r viewing. we need to store the state of all the object n all and render 3d for that. now, this kind of tech. is already present for rendring 3D graphics in games etc.

now also v have many softwares and web sites for creating a virtual world.
So more advanced computing a powerful softwares with comm. with brain can bring this concept to reality.