Build microelectromechanical systems (MEMS) using microscopes, tweezers, or pick-and-place robots. Slice substrates from single wafers and bond components onto the wafer surface through soldering and bonding techniques, such as eutectic soldering and silicon fusion bonding (SFB). Bond the wires through special wire bonding techniques such as thermocompression bonding, and hermetically seal the system or device through mechanical sealing techniques or micro shells. Seal and encapsulate the MEMS in vacuum.