UN: World's population hits 8 billion on Tuesday

(The Hill) -- The United Nations said the world population hit 8 billion people on Tuesday, although overall growth rates in the total population are slowing.The 8 billionth person was born somewhere in the world on Tuesday, according to UN projections.
The population milestone was reached owing to a gradual increase in the average human lifespan, accomplished through improvements in medicine and public health.It took just 12 years for the world population to grow from 7 billion to 8 billion peo