This Greek mathematician was known for his work in geometry and physics. The Greek army used two of his inventions: the catapult and the mirror system. Egyptians later used a screw system that bears my name to Irrigate the Nile River Valley. Who am I?

Archimedes

Explanation:

In the Nile, there is a place called Archimedes' Screw.

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aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on