John Horgan in Science & Spirit:
As a science writer, I am sometimes asked what I consider to be the most important unsolved scientific problem. I used to rattle off pure science’s major mysteries: Why did the big bang bang? How did life begin on Earth, and does it exist anywhere else in the cosmos? How does a brain make a mind? Sometime after 9/11, however, I started replying that by far the biggest problem facing scientists—and all of humanity—is the persistence of warfare, or the threat thereof, as a means for resolving disputes between people.