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Richard McKirahan is inaccurate with amber (cf. comment #2). The rubbing of amber on fur incurs electrostatic charges, which is not a magnetic phenomenon.

The ancient Greeks are of course excused because they did not yet have a sufficiently worked out theory of electromagnetism. They were the giants who started it, and on whose shoulders Maxwell and the likes stood when they worked it out. What I referred to was "(which has magnetic properties when rubbed or heated)", which appears to be an insertion of Richard McKirahan, who lives in our time and should have referred to electrostatics.

In case you travel to Copenhagen, I recommend to visit the Amber Museum there.