They are not my parents but they talk about Nanoscience and surface tension in The Secret World of Arrietty. It is a Disney movie.
Check it out the post here:
http://www.wired.com/geekdad/2012/02/arrietty-nanoscience/#more-111693
'Dyne With Me' explores surface tension of solutions used in everyday life. From inks to alcohol, drugs to dish soap, and everything in between....
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