Archimedes (187 - 111 BC) was a great mathematician of ancient times. His greatest contributions were in geometry. He also spent some time in Egypt, where he invented the machine now called Archimedes' screw. This site gives a brief overview of his life a
To function underwater, submarines are built a bit differently than surface ships that float on the water's surface. In order to travel underwater, submarines must function in agreement with some key laws of nature, including Archimedes' Principle and Boy
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