Engineering

Desktop 3-D printing in metal or ceramics

These spur gears—seen here with a euro cent coin for scale—have been produced in stainless steel to a space standard of quality using nothing more than an off-the-shelf desktop 3-D printer.

Engineering

Engineers combine light and sound to see underwater

Stanford University engineers have developed an airborne method for imaging underwater objects by combining light and sound to break through the seemingly impassable barrier at the interface of air and water.