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December 5, 2017 0

By Sujan Dahal Hydrometer is a device for measuring some characteristics of a liquid, such as its density (weight per unit volume) or specific gravity […]

Evolution of Electric Bulb

October 19, 2017 0

Dr. Suman Paul Rishi Bankim Chandra Evening College, Naihati, India  Imagine our world without light. Just put off your eyes and think. It seems to […]


March 13, 2016 1

Subhash Sharma We take it for granted that we can fly from one side of the world to the other in a matter of hours, […]

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