When I tell people that violence has been in decline for long stretches of time and that we're probably living in the most peaceful era in the history of our species, they think I'm nuts.
وقتي من به مردم بگويم که خشونت کاهش خواهد يافت در طي يک مدت زماني طولاني و احتمالاً ما در محيطي بسيار آرام و امن زندگي خواهيم کرد