Topics from April 2017
- How does a Zip Fastener work?
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- How does an Electric Typewriter work?
Posted by Keshav Jain on
- How does an Aerosol spray work?
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- What is radar and how does it work?
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- What is an Atom Bomb?
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- How was the rocket developed?
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- How was the submarine invented?
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- What is Superconductivity?
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- How was the telephone invented?
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- Who invented transistor?
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