Evolution into primates. The birth of human beings, the fourth animal category : the Humanozoic eon. 10000 years ago : The Agricultural Revolution. 5000 years ago : The Urban Revolution. 2400 years ago : The Religious Revolution. 300 years ago : The Industrial Revolution. The Information Revolution. Human beings are morphologically a kind of primate, but we have invented science and civilization due to our very complex and highly developed brains. From this point of view, human beings can be regarded as "the fourth animal category", which is completely different from other life. The birth of human beings is one of the most significant events in Earth-life history, and we can regard this period as the Humanozoic era.