Pioneering work to test Newtons law of Gravity and String Theory are underway. The basic premise of the study is to test physics and its most fundemental laws.
This is from the BBC:
"A pioneering technique using subatomic particles known as neutrons could give microscopic hints of extra dimensions or even dark matter, researchers say
The idea rests on probing any minuscule variations in gravity as it acts on slow-moving neutrons in a tiny cavity......The neutrons are shot between two parallel plates, one above another and separated by about 25 micrometres - half a hair's width. The upper plate absorbs neutrons, and the lower plate reflects them.
As they pass through, they trace out an arc, just like a thrown ball falling due to gravity. If they hit the bottom surface before passing through, they are reflected off and absorbed at the top - and thus are not detected at the other end of the plates."
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