The present book, Scientists Inventions and Discoveries is one among the five books of the series, Children’s Encyclopedia – The World of Knowledge. The book has been broadly divided into two parts- Part-I: The brief life histories and salient contributions of some well-known Scientists like Archimedes, Albert Einstein, Charles Darwin, Galileo, Newton, Louis Pasteur, Michael Faraday, Marie Curie, Thomas Alva Edison and many more. The second part or Part II emphasises on some major Inventions and Breakthroughs in the scientific world, such as: Bacteria, Vitamins, Vaccines, Aeroplane, Electricity, Cinema, Steam Engine and so on which have revolutionised and transformed the human life completely.