The reason why we cant revive frozen people
Theories that might solve the problem
When you see the magnified ice crystal in this picture, imagine it in a human cell - a minute sack with a membrane wall. The little sharp stalagmite edges would rupture such membranes. Imagine if it is what happens inside every human cell when frozen. The crystals puncture our cell walls and as we defrost our cell structures can't contain water and we turn to mush. That is why we can't defrost frozen people. The links above offer ideas that could provide answers for Tomorrow. Cryogenics can be very useful to us, in the future, if the defrosting can be mastered to bring a human out of cryogenic freezing - intact. Obviously, it is much easier said and imagined in theory.