Big Chunk Of The Universe Is Missing -- Again

ScienceDaily (2007-11-05) reports:

Not only has a large chunk of the universe thought to have been found in 2002 apparently gone missing again but it is taking some friends with it, according to new research. The new calculations might leave the mass of the universe as much as ten to 20 percent lighter than previously calculated. The same group that found what was theorized to be a significant fraction of the "missing mass" that binds together the universe has discovered that some x-rays thought to come from intergalactic clouds of "warm" gas are instead probably caused by lightweight electrons.

... and I think it is odd how often I lose my keys!