Memory metal is an alloy that can be “trained” to take on a predetermined shape in response to a stimulus such as a change in temperature. For example, a linear wire can be twisted and bent, yet will return to its original shape when heated above a characteristic temperature.* Many alloys exhibit this characteristic, although the effects are not always as dramatic. Some examples of shape-memory alloys include copper-zinc-aluminum, iron-manganese-silicon, gold-cadmium, copper-aluminum, copper-aluminum-nickel, and the subject of this module, nickel-titanium (NiTi). This activity includes a number of investigations and focuses on exploring the properties of memory metal that has potential to be put to use in a practical application.