Greatest invention of the 20th century? - Penny Arcade

A little late in posting this, as the anniversary was almost two weeks ago, but here is my tribute to what I consider the greatest invention of the 20th century: Willis Haviland Carrier's Air Conditioning Unit.
This is the sound of an AC, then the sound of two AC's, then three, then four, then the sound of five units.

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Here is a list I put together off the top of my head in alphabetical order of the 20 Greatest inventions of the 20th Century that without them would make our everyday lives difficult. I classified health items like Aspirin as an invention amd if an invention had offshoots or supplements like the TV with HD TV and the computer with software, it would still count as one item. I’m sure I’ve left many inventions out and if I did please let me know in the comment section and also what you would have them replace.

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Composition: THE GREATEST INVENTION OF THE 20TH CENTURY- PENICILLIN