Tech-no-logy:

Many of us would have come across May science fiction strings (shortly called as Sci-Fi stories). Most of them deal with the future. The authors would have predicted what might happen in the future. The authors' creativity shows its wideness on the new machines and working methodology of them. On the whole, we can broadly classify the technology under few categories. All the sci-fi machines work under chemical technology, electrical and electronics technology, advanced physics and bio technology.
Take whatever stories you want. The concept behind the sci-fi story will surely comes behind these technologies since they are the basic technology which is advancing in the technology era. In other words, it is considered as a new technology or advancement in technology only if the fields which were stated above get above improvement. Not only yesterdays', not only today’s' but even the tomorrow's writers who will write science fiction stories which follows the above stated suit.

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I have completed quarter century in the earth recently. I can see the changes that occur in an around me. The environment, technology and everything is charging. We can't see something today which existed five years or a decade back. The best example is pager. When pager came to the market, it was a massive hit. But today, no pager exists in the world.
Likewise, what if a guy from past let it be a guy who born before Christ comes again now and see the world? What would be his feelings on seeing a world which is entirely different from his age? How will he react with the environments? How will he survive in the world? He will like to stay here or wish to go back to his years?
The same way what will a guy from today's world is been sent to the past. I have an answer for this. He will commit suicide or go Crazy.