What Is Man’s Greatest Invention?

A car. An airplane. A space shuttle. The clapper. The light bulb. A lot of these man-made inventions over the years have made quite an impact on how we live each and every day.

Some inventions we could not live without. It would just screw up our way of life. So, what do you think is man's greatest invention?

Some popular answers from our facebook fans were:

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