Can delivery drones and robots make it in “the last mile”?

Today, delivery is a bigger business than ever, with more than two billion packages being delivered this holiday season. John Blackstone got access to the testing of delivery drones that may replace many of those truck deliveries. And then there are the Kiwibots – four-wheeled robots that navigate sidewalks to bring food to hungry college students in Berkeley, Calif. Blackstone also witnessed something somewhat anachronistic in these times: organic dairy products delivered by a milkman.