What's Happening to This World?

There is an interesting theory that evolution of the whole word moves like spiral. Things population once has experience they live over again but in different quality. Is it true ore another scientific theory without substantiation? If we ground on history we can see lot of civilizations that have reached highest point in their development and then have been destroyed. For example Ancient Greek culture has been taken over by Roman Empire, but Roman Empire – by other nations of Europe. …