i know u r laughfing at this stage but one thing i wanna tell you that my grandfather told to my grand grand parent that he want to talk to my grandmother from mumbai and she will her that voice in M.P they laugh at taht time.

what concept i thing at this stage is that to store a memory we use metal which we find that element in third rock from the sun (earth) 

our brain is made up of neuron networks to stroe and retrave memory.