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HIGHLY RECOMMENDED. Most interesting theory I've seen in a long while.

It's an extension/elaboration of the theory of The Fourth Turning (Strauss–Howe generational theory) that noticed that human civilization seems to follow a 80 year micro-cycle with war breaking out every 80 years, fertility increasing and collapsing over the same time period (but at a different phase). The Fourth Turning noticed the pattern but could not explain it.

The amateur scientist Janne Miettinen was fascinated by this and, through his own research, noticed that data/measurements of levels of the 4 human hormones testosterone, growth hormone, dopamine and cortisol followed a 80 year cycle (!!), such cycles also exist in the animal kingdom, and thus could possibly be the basis of the micro-cycle.

HIGHLY RECOMMENDED. Most interesting theory I've seen in a long while. It's an extension/elaboration of the theory of *The Fourth Turning* (*Strauss–Howe generational theory*) that noticed that human civilization seems to follow a 80 year micro-cycle with war breaking out every 80 years, fertility increasing and collapsing over the same time period (but at a different *phase*). *The Fourth Turning* noticed the pattern but could not explain it. The amateur scientist Janne Miettinen was fascinated by this and, through his own research, noticed that data/measurements of levels of the 4 human hormones testosterone, growth hormone, dopamine and cortisol followed a 80 year cycle (!!), such cycles also exist in the animal kingdom, and thus could possibly be the basis of the micro-cycle. [hormonal cycles](https://jannemiettinen.fi/FourthTurning/hormone-cycle-animal-populations.png) [*The "original" Strauss–Howe generational theory*](https://en.m.wikipedia.org/wiki/Strauss%E2%80%93Howe_generational_theory) [*Miettinen's theory: CYCLICAL METAPOPULATION MECHANISM HYPOTHESIS*](https://jannemiettinen.fi/FourthTurning/)

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Which book? If you're talking about Dutton, I like the guy, I think he's right about many things. I am convinced that dysgenics is a big factor behind the fall of civilization. It's not the only factor, many factors contribute.