Monday Mayhem!! Top Ten Inventions of the 20th Century

This may have been invented before the 20th century - am wanting to try to say High Carbon Stainless Steel - especially for surgical instruments but don't know what to call it exactly.

[EDIT --- Surgical Steel? - I'm sucha goof]
 
Issac Asimov is here with me and he guessed, "Robots".
 
I gotta run for a while and pick up the kiddies at school. Be back in a while!
 
Theories, such as the Theory of Relativity don't qualify as inventions, do they? If they do, put my buddy Albert and his thoughts on the list.
 
Mike, don't you dare put Mel Gibson on the 'dud' list. Do not even think about it. :angry
 
Bill Gates didn't make the cut, eh? Well, he stands in good company with Mel Gibson!

micro chips
 
Slowing down here, as to be expected. Maybe some hints tomorrow? The three left very in the ways they impacted the world. :chin
 
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