A new experiment planned at Fermilab will allow researchers to peer into the sub-atomic world of virtual particles and resolve a decade old mystery. The Fermilab muon g-2 experiment will use an intense beam of muons, short-lived particles that are similar to electrons but 200 times heavier.
http://www.symmetrymagazine.org/breaking/2011/08/19/new-fermilab-experiment-to-take-muons-out-for-a-spin/