Ceramic knives provide certain advantages over metal blades. They are harder than steel and hold their edge longer. On the rare occasion when a ceramic knife needs sharpening, a grinding wheel coated in diamond dust must be used. Their nonconductive, nonmagnetic properties make them useful in bomb disposal, and their resistance to corrosion is ideal for scuba divers. However, ceramic knives are also more brittle and shatter more easily than metal ones. Why is metal often used in their handles? Discuss