Simple Mechanics [antikvár]

Our planet teems with human life. Mathematicians studying historical records estimate that the world's population in 7000 BC (only nine thousand years ago) was about ten million people. At the birth of Jesus Christ, the number of human beings had multiplied to nearly 300 million (over thirty times as many) — and as many people as there are now in Western Europe alone. The population in 1974 was a staggering five thousand million men, women and children. Scientists have estimated that the total number of people who have ever lived is around 100,000 million, and in the last 100 years there have been more human beings alive on earth than lived in the preceding ten thousand years.