For hundreds of years, writing was it. And then we expanded it across time and space by in stamps. So now it's not just the writing that is in your local library, but you could take your writing and send it to some one else. The telephone is where we really see a shift happen. We didn't know what to say when we answered the phone until thomas edison suggested maybe hullo. Then radio shows up. At the beginning, radio was live, all live, all the time. You had live actors doing live plays. If you missed it, it was gone. But then, thanks to edison, we had recordings, and they came out of the