How weak are WIMPs?

Weakly Interacting Massive Particles, or WIMPs to the scientists looking for them, are one of the particles proposed to try and solve the problem that we don't seem to be able to find 90% of everything (the Dark Matter).

In an experiment running for 58.6 days, the Italians have reported that none of these particles have interacted strongly enough for them to see them. Their plan now is to scale up their 5.4kg detector to a 100 kg one to run in 2009, in the hope of finding these feeble particles.

With the rival MOND theory also having had a limit on its strength proven recently, the search for the solution to the fact that galaxies just don't rotate in the way we expect them to continues.