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I recently watch a documentary with the above title made according to the opinion of a panel of experts. http://www.popularmechanics.com/technology/gadgets/reviews/101-gadgets-that-changed-the-world .

I list below in decreasing order of importance their top ten choices for your information, thoughts, and deliberation:

1.The smart phone

2.Radio

3.Television

4.Hypodermic Needle

5.The personal computer

6.Air conditioner

7.Telephone

8.Phonograph

9.Alarm clock

10.Light bulb