Thales of Miletus (624/623-548/545 BC) [Wikipedia] Amber and Electricity
BC	Diogenes Laërtius Lives of the Eminent Philosophers (translated by Robert Drew Hicks) (William Heinemann, London, 1925) Thales, pp. 14-23. [WikiSource] [Wikipedia] [Archive] [Archive] [Archive] [Archive]
BC	G. S. Kirk and J. E. Raven The Presocratic Philosophers (Cambridge University Press, London, 1957) Chapter II, Thales of Miletus, pp. 74-98. [Archive]