During WWI, New Zealand raised an army of 100,000 men, about 10% of its population.
Established writers and artists are 18 times more likely to commit suicide than the general population.
McDonald's restaurants feed 68 million people every day. That's more than the entire population of the U.K.
Indonesia is home to the world's largest Islamic population.
Roughly a third of the world's adult population smokes.
The Chinese smoking population is higher than the entire population of the U.S.
The Black Plague destroyed half the population of Europe in the fourteenth century.
The Roman Catholic population of the world is larger than that of all other Christian sects combined.
Chang Hsien-chung, a Chinese bandit, is credited with having killed 40 million people between 1643 and 1648. He completely wiped out the population of Szechwan province.
The population of the entire world in 5000 B.C., according to the National Population Council, was 5 million.