Strato of Lampsacus (c.335–c.267 B.C.), Greek philosopher and polymath nicknamed ‘the Physicist’ for his innovative ideas in natural science. He succeeded Theophrastus as head of the Lyceum. Earlier he served as royal tutor in Alexandria, where his students included Aristarchus, who devised the first heliocentric model. Of Strato’s many writings only fragments and summaries survive. These show him criticizing the abstract conceptual analysis of earlier theorists and paying closer attention to empirical evidence. Among his targets were atomist arguments that motion is impossible unless there is void, and also Aristotle’s thesis that matter is fully continuous. Strato argued that no large void occurs in nature, but that matter is naturally porous, laced with tiny pockets of void. His investigations of compression and suction were influential in ancient physiology. In dynamics, he proposed that bodies have no property of lightness but only more or less weight. See also HEL- LENISTIC PHILOSOPHY , LYCEU. S.A.W.