-- does it take to change a light bulb?
Six. One to remove the old bulb and examine it under the
microscope to find out what went wrong, one to blow a tube of
glass into the bulb shape, one to coil the tungsten wire
filament, one to clean up the metal base of the old bulb, one
to operate the vacuum pump to get rid of the air in the bulb
and one to apply the glue to seal the new bulb into the old