What inventions in the history of manking do you regard as most important?

It is no doubtthat mankind history is full of important and significant events and inventions.To my mind, one of the most important inventions is penicillin. A scientist namedAlexander Fleming was doing research at Hospital in London and he was lookingfor something to fight bacterial infections.Use ofpenicillin did not begin at once. Howard Florey and Ernst Chain isolated theactive ingredient and developed a powdery form of the medicine. So they wereable to make enough penicillin to establish it as a value drug. The world nowhad a valuable treatment that would save the lives of millions.Penicillin todayis a very important prescription drug. It is very effective against fungi,parasites and bacteria.

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