Anaxagoras, born about 500 BC, is the first person who is definitely known to have explained the concept of a "nous" (mind), which arranged all other things in the cosmos in their proper order, started them in a rotating motion, and continuing to control them to some extent, having an especially strong connection with living things. (However Aristotle reports an earlier philosopher, Hermotimus of Clazomenae, who had taken a similar position.) Amongst the pre-Socratic philosophers before Anaxagoras, other philosophers had proposed a similar ordering human-like principle causing life and the rotation of the heavens. For example, Empedocles, like Hesiod much earlier, described cosmic order and living things as caused by a cosmic version of love, and Pythagoras and Heraclitus, attributed the cosmos with "reason" ("logos").