Brazil is building one of the largest hydroelectric projects in the world, tunnelling through seven mountains and building two dams, all to create enough power to keep Rio de Janeiro from going dark during the upcoming Olympics and World Cup.

Featured: Boston beer; cast aluminum pots; bricks; baseball gloves.

Featured: school lockers; frozen pizza; plastic railroad ties; tissues.

Featured: pipes; rock climbing gear; leather bike saddles; luxury sports cars.

Featured: surgical instruments; ketchup; double-decker buses; walking sticks.