It all began with nano-machines. The military developed a network of 
sand, machines the size of a grain of sand, that had sensors and the 
ability to connect and communicate?? through a "mesh" network. Each grain 
of sand could "see" the little space around it, send its observations to 
another grain of sand, passing it through the network of sand, until it 
reached the mother-ship computer. There, the tens of thousands of pieces 
of information were pieced together into a picture that could be 
understood and used by a human. All someone had to do was throw a 
handful of sand into a room and a three-dimensional video and sound 
replica of the room could be created, real time, by an observer anywhere 
on the internet.
The sand particles got smaller and smaller, until they could become an 
aerosol, sprayed into a room, like a deodorizer. The mesh network of 
little observers now floated in the air. It didn't take long for medical 
researchers to start asking patients to inhale the tiny bots. And the 
world of the body opened into real-time observations of blood flows and 
biology.
Smaller still, and the tiny observers made it into the brain, into every 
neuron, observing and reporting on every connection and interaction. 
Soon enough, a model of the mind was populated with this matrix of 
observations, and people's minds were able to move to digital replicas.
 
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