WIMP

''Bobacus has seen "Windows, Icons, Mouse, Pull-down menus", but prefers the first definition.

Also: Weakly Interacting Massive Particle, something invented by cosmologists to explain how the universe hangs together with such little apparent mass. -- Jumlian

Vitenka has heard a recent theory of much smaller particles, in much larger quantities.

This is "massive" in the sense of having any mass at all; they don't need to be particularly huge.  Neutrinos could do it (there are, after all, quite a lot of them around, and they interact only very weakly), if anyone could determine their mass. -- NickTaylor

If only they didn't oscillate between the Tau- (heavy), Muon- (not quite so heavy), and Electron-related (floaty light) masses, then it'd be a lot easier to tell what was happening... but then it wouldn't be any fun, I suppose. --Jumlian

Assuming, and it's a big assumption, that PartII? ParticlePhysics? is in any way valid, the oscillations are a necessary symptom of neutrino mass.  As the Standard Model has massless neutrinos, and neutrino oscillations have been observed, this slightly breaks stuff. -- NickTaylor, mocking the theoreticians

Ah.  The famous [Quavers] particle.  --Vitenka