A more speculative hypothesis is that the invention of the bow and arrow and other cutting-edge projectile technologies revolutionized the costs and benefits of reactive aggression. For the first time, slight Davids like me could take down Goliaths, and females could defend themselves more effectively against male aggressors. Weapons like the bow and arrow also helped less brawny individuals hunt effectively and with reduced risk at a distance. Since the bow and arrow was invented 100,000 years ago, it has probably been less advantageous to be big and reactively aggressive.67 Wouldn’t it be
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