Host Mo Rocca shows us how drones are searching for sharks to keep beaches safe; the medicine-free pain relieving device; how collecting water in Africa is less of a pain in the neck; and the battles over famous patents.

Host Mo Rocca shows us the TV pitch man and inventor behind dozens of inventions including the Pocket Fisherman; the listening device that can find people buried after an earthquake; measuring your rooms and creating a floorplan of your house with a cellphone; and how air mail changed how we communicated.