At Space.com there is a story detailing the use of tiny gold and germanium spheres and a nano-cantilever used to make the most accurate measurements ever of both the Casmir Effect and of gravity's effects at the quantum scale. A tiny gold sphere on a nano-cantilever was placed over both another tiny gold sphere and over a tiny germanium sphere that had a thin coating of gold. The Casmir Effect was measured more accurately than ever in the distortion to the nano-cantilever when the gold spheres were brought within a few hundred nanometers of each other, but when the denser gold coated germanium sphere was used they not only measured the Casmir Effect again, but the denser germanium sphere allowed them to make quantum scale measurements of the effect of gravitational attraction as well. Their results were that gravity behaves as predicted by Newton. The Casmir Effect measurements are also believed to be of value to nanotechnologists in the design of tiny machines and the effect of nano-particle clumping. They plan to repeat the experiment in the future with a similar device designed to be up to 1 million times more sensitive.

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...and we'll be saying a big hello to all intelligent life forms everywhere; and to everyone else out there, the secret is to bang the rocks together, guys...