Host Mo Rocca shows us how returning wolves to Yellowstone National Park changed nature; Vine's six-second Spielberg, Zach King; the rivalry between Nikola Tesla and Thomas Edison; and the new beehive that makes the honey flow.

Host Mo Rocca shows us what device is keeping sharks away from swimmers; the video doorbell connected to your smartphone; the history of the DC-3 airliner; and the coating for plastic bottles that gets the last drop.