With the share of married adults at an all-time low in the United States, new research by demographers at Cornell University and the University of Central Oklahoma unveils clues why couples don't get married -- they fear divorce.
Which person had the greater impact in the 20th Century? According to Nature, it is the duo Haber-Brosch because of their invention. Their Haber-Bosch process has often been called the most important invention of the 20th century as it “detonated the population explosion.
It was just over two centuries ago that the global population was 1 billion — in 1804. But better medicine and improved agriculture resulted in higher life expectancy for children, dramatically increasing the world population, especially in the West.