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Approximately what is the length of the Suez canal?
The method of soil conservation in which different crops are grown in alternate rows and are sown at different times to protect the soil from rain wash is called?
Raymond Samuel Tomilson is famous for developing which of the following?
A force of 200 N displaces a body by 4 m, calculate the work done (in J).
Who discovered television?
Who discovered electricity and invented the lightning rod and bifocals?
Who discovered Oxygen?