This is an amazing work. A group of physicists in Germany has made a "direct" measurement of the critical Casimir forces[1]. I suppose this is as direct as it can get, as of now.
There is a News and Views coverage of this paper in the same issue of Nature, and also on the Physics World website.
Zz.
[1] C. Hertlein et al, Nature v.451, p.172 (2008).
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