by 
Juliet
ANSWERS: 12
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The guitar. Because without that invention, I wouldn't have anything to listen to.
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Penicillin was the greatest I think.
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Electricity & Electronics. The advancements stemming from its use are far too numerous to comprehend. Everything from your automobile, to medicine, down to aluminium cans can thank their existence and use to this wonderful discovery. Heck! Where would AB be without it?
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The wheel, yabba dabba do!
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Irrigation. Where would we be without water?
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The discovery of fire.
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perhaps the combustion engine? That's quite useful.
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life would be pretty dull without the harnessing of electricity......pardon the pun.......however that could also lead to our demise if we are not careful
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I think it was when babies were invented :P that or popcorn. video games as well.
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The invention of a language would be the most important because it permits information to be passed on to those that come after us!
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In recent times? The steam engine I'd say, pretty much changed the world completely. Some people might say the internal combustion engine, but it's based on the same techniques as the steam engine
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I'm going to go with soap/antibacterials.
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