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2015-01-04T16:18:35+05:30

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Light bulb Because it is the only thing that can produce light and makes us less afraid about night
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2015-01-04T16:19:11+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The best invention by a man is the wheel

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i hope electricity. coz widout it no other appliance wud wrk