Psychology, Groups, Group Dynamics, Efficiency, Teamwork.
from 10,000 BCE to 2020 CE, adapted from the US Census Bureau data, shows very rapid growth since the 18th century. In the span of 40 years, from 1959 to 1999, the world population doubled from 3 billion to 6 billion. According to US Census Bureau projections, the world total will reach 9 billion