We Don't Have Conversations Like This Anymore

I called my little brother on the way to work yesterday. No reason. Nothing to report. Just picked up the phone somewhere on the drive and called him because I felt like it. By the afternoon we were still texting. By the drive home, I called him back, because whatever we'd started that morning clearly wasn't finished. What were we discussing? Everything. But not in the way that sounds. It started somewhere near the Ship of Theseus — the old thought experiment about a ship that gets one plank...