Which could be the best invention of humankind?

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Which could be the best invention of humankind?

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2014-01-24 nishith 80.00 Check this speaking
2012-10-31 nargess1981 68.33 Check this speaking
2014-10-07 ket2014 83.33 Check this speaking
2014-02-05 divjais186 87.50 Check this speaking
2016-03-29 nishith 33.33 Check this speaking
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