Dear Justin, I’m not sure if you’ll see this letter, as we’ve been out of touch since you unfriended me…

At the center of the vast difference between humans and every other species to call Earth home, and the fatal complication for every theory that purports to explain all, is speech. Language. It’s the main thing that separates humans from every other species, and makes possible the things that make humans human — abstract thought, the ability to remember the past and contemplate the future, to have aesthetic, intellectual, and spiritual lives.