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Ask question how many years that our earth survived?#Minimum 100 words accepted#
Water-mill in Golden era: The water-mills were also invented in the classical period. But they came to be widely used only in the Middle Ages. The wind-mills and water-mills
laboratory apparatus for separating mixture
I want to know the layers of the atmosphere
describe the factors which decide the broad area of scientific activity
Technical Developments in Feudal Society: Other innovations used and improved by the Europeans were the lenses and the spectacles. This gave an impetus to the further study
#question how can i easily remember the order of draw and the colors of the tubes and their purpose? ..
Atomic energy: In view of the fast depletion of our non-renewable resources like coal and petroleum, and because of pollution which power stations burning coal cause, there h
A lift pump To change the syringe and make a simple lift pump, burn two holes by the piston with a hot wire and fit a thin piece of leather or rubber above them to act as a val
Improvement of Techniques and Crafts : In this period, there was a spurt in agriculture, as new techniques and seeds were introduced. More importantly, the crafts greatly improv
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