How might future science be able to revive cryopreserved humans or animals ?
A future nanotechnology of molecular-sized machines might be able to repair freezing damage or other damage associated with cryopreservation − as well as damage due to disease and aging. Such repair capabilities are described in detail in the book ENGINES OF CREATION by K. Eric Drexler. With vitrification the repair requirements are much less. With suspended animation nanomedicine will only be required to reverse the damage of aging and disease.