This year's issue is again exciting not only because People with common goals establish communities. Usually, in the natural sciences, communities originate it lists the 1 OOth excited resonance state, but also be- around fields because institutions, conferences, and cause it contains extensive new information and addi- 197 the literature are normally field oriented. In excep- tional interesting articles on Au by Louis Roberts, 151 tional cases, communities have a method as the com- Eu by Chris Barton and Norman Greenwood, and 129 mon bond, for instance, Mossbauer spectroscopy. The I by Hendrick deWaard. One innovation might be minimum requirement to be a "Mossbauer woman or suggested: for our irreproducible results we have the man" seems to be the possession of a Mossbauer sys- International Journal of Irreproducible Results; how- tem and the MEDI. Every member of the M6ssbauer ever, there is no literature for our reproducible nega- community must have realized our extremely fortunate tive results.Sometimes nature's hidden tricks are un- situation: before we put a drive system into motion known to us and experiments with some isotopes are we know within minutes if similar work has been pub- tried unsuccessfully again and again. A chapter for lished somewhere in the world.