From Makezine.com: http://blog.makezine.com/archive/2012/01/the-tesla-valve-one-way-flow-with-no-moving-parts.html
The Tesla Valve is a one-way valve with no moving parts. Its geometry resists the flow of a fluid in one direction by redirecting some of it back at itself. I don't think it perfectly stops the fluid but it greatly resists it.
Shapeways user imperator made a printable version (with an unpictured cover) which he demonstrates in the video by blowing through it.
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