Humans have been killing those who disagree with them pretty much since we arrived on the planet (whenever you believe that was). Sadly, we continue to do that to this very day, despite the invention of more peaceful alternatives.The handshake was designed to be a gesture of peace, to show the lack of weapons in one’s hand, although there were obvious shortcomings in that method (“hey, where’s his other hand?”). Diplomacy was then invented so that we could try using our words instead of our weapons. That, too, has its limitations, but it remains a widely preferred method of resolving ...