Vol. 29 (4) 2008 Neuro endocrinology letters

500-year periodicity of political instability in the history of ancient Egypt and China. Androgens at work?

UNLABELLED: DISCOVERY: A periodicity of 500 years has been discovered in the political history of ancient Egypt and documented by means of inferential statistics. Periods of chaos and waning of central power (some of them called "intermediate periods") recurred every 500 years.

DATA & METHODS: Input for the compu.....