If so how did he managed to see this as molecules weren't known in his days?
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$\begingroup$ In the only way that "works": observing and guessing hypothesis. $\endgroup$– Mauro ALLEGRANZAJun 27, 2016 at 15:01
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$\begingroup$ For details, see e.g. Charles Kahn, Anaximander and the Origins of Greek Cosmology (1960). $\endgroup$– Mauro ALLEGRANZAJun 27, 2016 at 15:03