Here is some information and the link to the manufacturer of the muscle wire demonstrated in the Fly Trap piece. Take a look.From the Dynalloy, Inc. website:
Dynalloy, Inc. is a manufacturer of shape memory alloy specially made to be used as actuators. In other words made to provide movement much like a solenoid or motor would for many many cycles. The high repeatability of such applications requires a dependable, reliable and very repeatable material.
Dyalloy, Inc. manufactures these nickel titanium alloys as small wires under the trade name of Flexinol to differentiate them from other shape memory alloys which do not have theses same properties.
Flexinol actuator wires contract much like little muscles a distance of approxiamtely 4-5% when they are "on" and relax when they are "off".
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