Bill demonstrates the temperature-dependent shape memory of nitinol metal. He explains how "twinning" in the crystal structure of nitinol produces the memory effect. He shows a nitinol-based engine that is powered by temperature differences. He closes the video with a description of superelasticity, a phenomenon related to the memory effect, which he demonstrates with a cardiac stent. (This video is dedicated to my second son: born right after the rough draft was finished, and who, thus, delayed the filming of the final video by eight months.)
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(Short Spike)
In the future, a bored student sitting in math class takes apart his pen. As always, he fucks up that little spring that makes the pen do its clicky thing. The spring heals itself, forcing the kid to get back to fucking work and pay attention.