Amazing sculptures that move on their own… the creator of these is probably going to be a lot more famous, but for now he may need an introduction… Theo Jansen makes these in Holland:

Strandbeast – a beast (or beest) that walks on the sand, hoping to be a viral video star! More seriously, Theo has a website where an upcoming movie is referenced – strandbeest.com.

A ferro fluid is, well, watch the video and read the description under it while you watch:

definition “A fluid in which fine particles of iron, magnetite or cobalt are suspended, typically in an oil.” (from webopedia, and they were invented by NASA. Answers.com defines it as “A colloidal suspension that becomes magnetized in a magnetic field because of a disperse phase consisting of ferromagnetic or ferrimagnetic particles. “