Smart or shape memory materials are an invention that

Smart or shape memory materials are an invention that has changed
the world of engineering. There are two types: metal alloys and plastic polymers. The metal alloys were мейд first and they are usually an expensive
mixture of titanium and nickel.
Shape memory materials are called 'smart' because they react to changes
in their environment, for example:
plastics that return to their original shape when the temperature
changes. One use is in surgery where plastic threads 'remember' the
shape of a knot, react to the patient's body temperature and make
themselves into stitches. ПЕРЕВОД пожайлуста