I don't know that we've sufficiently evolved to walk and chew gum at the same time, yet here we are, walking and texting at the same time. The answer is obvious: there's going to come a day when we're going to be walking around in exoskeletons that save us from ourselves. Because walking where we're going and texting as we're going are both vital processes that can't wait a moment for us to attend to one or the other.
