In his new book, "The Better Angels of Our Nature: Why Violence Has Declined," Pinker makes the case that a smarter, more educated world is becoming more peaceful in several statistically significant ways. His findings are based on peer-reviewed studies published by other academics using examinations of graveyards, surveys and historical records:
- The number of people killed in battle - calculated per 100,000 population - has dropped by 1,000-fold over the centuries as civilizations evolved. Before there were organized countries, battles killed on average more than 500 out of every 100,000 people. In 19th century France, it was 70. In the 20th century with two world wars and a few genocides, it was 60. Now battlefield deaths are down to three-tenths of a person per 100,000.
- The rate of genocide deaths per world population was 1,400 times higher in 1942 than in 2008.
- There were fewer than 20 democracies in 1946. Now there are close to 100. Meanwhile, the number of authoritarian countries has dropped from a high of almost 90 in 1976 to about 25 now.
Pinker says one of the main reasons for the drop in violence is that we are smarter. IQ tests show that the average teenager is smarter with each generation. The tests are constantly adjusted to keep average at 100, and a teenager who now would score a 100 would have scored a 118 in 1950 and a 130 in 1910. So this year's average kid would have been a near-genius a century ago. And that increase in intelligence translates into a kinder, gentler world, Pinker says.
"As we get smarter, we try to think up better ways of getting everyone to turn their swords into plowshares at the same time," Pinker said in an interview. "Human life has become more precious than it used to be."
Pinker argued his case in a commentary this past week in the scientific journal Nature. He has plenty of charts and graphs to back up his claims, including evidence beyond wartime deaths - evidence that our everyday lives are also less violent:
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