The war on Heisenbugs
In modern physics, Heisenberg's uncertainty principle loosely says that there is an absolute theoretical limit to how well a particle's position and velocity can be known. Regardless of how good a laboratory's measuring equipment gets, funny things will always happen when you try to pin things down too far.
Heisenbugs, loosely speaking, are subtle, slippery bugs that can be very hard to pin down. They only manifest under very specific conditions and may even fail to manifest when one attempts to investigate them (note that this definition is slightly different from the jargon file's narrower and more specific definition at http://www.catb.org/jargon/html/H/heisenbug.html, which specifies that attempting to measure a heisenbug ...
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