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     Invention is the activity of investigating and finding a new method of achieving something, or a new device for use by people, or a new principle or concept or law that governs some physical quantities.  An invention is a qualitative jump over the existing implementation.    Inventions are the ones that made man progress from cave man to a a space voyager.

1.   Language:

     Among the ancient inventions, the invention of a Language and its script as a medium of communication is the most important invention.  With out a means to express ones views either verbally or by means of writing, human beings would have been as good as the cave man.

         The language made a person do some thing in a life time and pass it on to the next generation.  The knowledge and culture gained by one generation became the starting point for another generation.  Hence we progressed.  We had books because we had a language to write.  Without reading books, even the great scientists could probably not invent much.

2.  Wheel

      The rotating wheel is one of the most important inventions of the ancient man.  A wheel is the basic part needed to transport a person or a good across from one location to another.  Without a wheel, pyramids, Eiffel tower, Taj mahal, and perhaps even our own house could probably be not built.  People had to walk and carry every load by themselves or on animals.  Many people would be doing labour work still, with out a wheel.

3.  Semiconductor transistor

        The invention of a semiconductor transistor device by Bardeen, Brittain and William Schockley has lead us to the development of most sophisticated computers, laptops, cell phones, calculators, appliances, weapons, gadgets etc.  In fact, this twentieth century advanced invention is the basis for every electronic device used today.

     With out a transistor device, there is no electronic control.  Half the total number of jobs in the world would not be there. Such a fast growth in the world would not be possible at all in the last fifty years.  This electronic device is controlling every other device now.  In fact, human being is not controlling the electronics any more.  It is the electronic controls that are controlling human beings.

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Invention have made starting from the stone age till now. Invention have played a defined role in human history. It has transformed human being in many ways. Since necessity is the mother of invention we would keep inventing for time to come. It is the fact that the invention are made to prove the military power of the  group, state etc. subsequently this innovation have been utilised for civil use. Since beginning of this century when invention in science and technology took a leap
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