Hank pretends he has an invisibility cloak, and describes how some enterprising scientists are working towards making things invisible using nanotechnology and mirages.

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Sources:
http://news.nationalgeographic.com/news/2009/05/090506-cloaking-device-star-trek.html
http://news.nationalgeographic.com/news/2006/05/060525-invisibile.html
http://nanotech.utdallas.edu/documents/Mirage.pdf
http://geekout.blogs.cnn.com/2011/10/17/cloaking-experiment-draws-comparisons-to-harry-potter/
http://iopscience.iop.org/0957-4484/22/43/435704
http://www.youtube.com/watch?v=3YO4TTpYg7g