In some rivers or canals the water is not too deep for large ocean-going ships. In such places large watertight compartments are built that help ships and boats go up or down different levels on rivers or canals.
Why do ships float on water when in fact they should sink? Why does paper float on water and a paperweight sink? The answer to these questions was accidentally discovered 2200 years ago by the Greek inventor and mathematician, Archimedes.
What would happen if all the lions in Africa are carried away to some other place? The deer population will rise as there will not be anyone to kill them. With this population boom, the deer would need more food.
Excerpts from ‘Rats’. First published by Vigyan Prasar, India
Now at this time there was a great plague of rats in the London Docks. They were specially fierce rats, whose ancestors had come on steamers from Hong Kong along with tea and ginger and silk and rice.
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