This tale begins in an insignificant galaxy with a common stellar system, in a tiny little blue Planet that can be found in the inhabitable zone.
In this planet there are an uncountable life forms, with uncountable secrets. There also the most different habitats and there is life everywhere.
This planet, like almost any notable one, gave birth to an intelligent being. Unlike other self-knowing beings this one was born without any strong abilities, just with a slightly more developed brain than other species. They must use imagination to develop ways to win over the thousands of thousands of problems that have been showed in their ways.
All along the history they lived in the most different habitats: top of the trees, inside caves, igloos, cabins, wooden houses, stone houses, palaces, cement houses, polymer houses, biological cabins, brain containers, and they died. Wait, is better to say that their extinction is the one like they defined: There's no way to repopulate the world with their species because there are just one "human alive".
Human alive is in quotes because the only thing that last of this man was his brain, living by a machine powered by the last functional generator of the world.
He was born in the nineties (199X) under the name Jose Gomes, in Brazil. His childhood was quite normal for a Latin guy: he liked to watch soccer but couldn't play well, he had to go to the school every day but didn't like it.
At school, he always had good scores even without studying, the reason why he could build up his interpersonal abilities.
At high school he learnt that he was a super genius, with an IQ of 300~350, with almost none effort and time he could finish his studies. He was the first and only man is history to win a Fields prize and two Nobel's simultaneously.
His life works was the Solution of the Riemann Hypothesis, that gave him the Fields Prize, the theoretical compound that planned a new kind of batteries of the size of a coin that could power a house for one hour that give him a Nobel in Physics. His last Nobel was a Peace One, to put all his fortune at the old age in a fund to bring basic sanitation to the peripherals' community around the world.
The last act he performed before his "first death" was donated to his brain to make researches, all for the advance of science (like many others self-centred and egotistical fools).
His brain was firstly used in cryogenic therapy, it was a success. There was only a slight problem with the reanimation later.
The brain was kept alive in a tube, where many experiments were made. Reaction to stimulation, absence of nutrients, excess of nutrients, shocks, temperature variation, wired connection with machine, synthetic neurons, sensor feedback system and, at the end, "second life" (the reanimation of the sentient soul of the brain).
Five hundred years of experimentation bring his mind to a chaotic state, he wakes with amnesia and several psychological damages. For another three hundred years his brain was used for psychological research, along with the technology research.
The last modification was to mutate his genes to develop a biological bridge between a microcomputer and the brain. The way was using a retrovirus to slowly change all the genes of his cells. After one hundred and sixty-four tries they made it.
During the period between his first and second life he suffered physical and psychological injuries, his usually high IQ was at 60~90 in the wakening time. Only after more a hundred years of medical, technological and psychological care he could turn back to something like the old himself.
His knowledge, that used to be top-notch, became outdated, his thoughts was slowed, everything about his mind was analysed. The only consolation was: his discoveries and the discoveries made of the researches on himself (and on many others' nobody) helped to change the world in the most different fields of knowledge. Therefore, he was prized as the Most Important Human Being Born in History, on top of figures like Confucius, Temujin, Napoleon, Siddhārtha Gautama, Jesus...
His only function now, as the oldest lab rat in the world, was trying to absorb and understand all the useful and important knowledge produced by the mankind. He and another nine other human selected was kept at the safest place in the world to act as bastion to the knowledge of humanity.
.....
Then something started to change in the lab, everyday fewer people come and at every single day he could see that something weird was happening.... The lab become "empty" in a second. His neighbours, without the caring of the nurses, started to die one by one.
His mind has at long became unstable. With all experiments made on his brain, the shortage of nutrients and sanitation of his capsule his brain started again to slowly degenerate. In the next 5 years his mind doesn't receive any new information about what happened with the world, he lived isolated trying to discover what happened while trying to keep himself sane.
One thing that saved his mind of the fall to complete oblivion was the knowledge stored in the machine, that he madly tried to absorb.
In his last second of life he had an epiphany, he wanted to share it but there was no one to listen.
In sadness, he let his spirit crumble and, after living for a more than a millennium, he died...