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in one word, its the 'Internet'. there are other discoveries. but i would prefer to name the Internet only.
My vote goes to Electricity. Thanks to Benjamin Franklin who invented Electricity.
Erm, mathematics, I guess. You don't get very far with the wheel, engineering, the internet or anything without mathematics.
Or language, for that matter.
Our ancient ancestors learned that if you mixed copper with a little bit of tin, you would get the sturdier and more useful metal bronze. This got the creative mind working to develop newer technologies with metals.
No one "invented" electricity.
I would go with the humble tin opener. Have you ever tried to open a tin without one? I have and nearly killed myself!
I am writing this only cause my answer is otherwise too short for hubpages
Computer and Mobile Phone are the greatest discoveries I like most.
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