Communication
Eudemus of Rhodes [b. Rhodes, Greece, c. 350 bce, d. c. 290 bce], a student of Aristotle's, combines his lecture notes with those of Aristotle and recollections from memory to produce the works of Aristotle as we know them. See also 350 bce Astronomy.
MathematicsEudemus of Rhodes writes histories of arithmetic, geometry, and astronomy, now lost. The History of Geometry and History of Astronomy, however, are cited as the principal sources for many later histories of the subjects, so their contents are well known. See also 320 ce Mathematics.
ToolsThe Chinese invent a form of bellows, known as the doubleacting piston bellows, that produces a continuous stream of air. Such bellows are unknown in the West until the fourth century ce. See also 300 ce Materials.
