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In it he summarised the all known information about astronomy and the mathematics which supported the theories. See Hypatia by Charles William Mitchell. Paper was an inexpensive new medium which provided a simple means of communicating accurately with others who were not present without the danger of "Chinese whispers" corrupting the message, but more importantly, it enabled knowledge to be spread to a wider population or recorded for use by future generations.
They did not have the benefit of cheap, off the shelf, mass produced batteries. The Greek philosopher and scientist Aristotle B.
Pictograms on a tablet dating from about B. He is credited by the Greek historian Plutarch A.
When heated over a flame the steam from the boiling water escaped through two tangential nozzles in jets which caused the sphere to rotate at high speed.