Hadron physics in low-energy antiproton beams

The present state of low-energy nucleon-antinucleon physics is reviewed. Some recent experimental results, described here, cannot be explained in the standard potential models without appealing to a quark-gluon structure of the hadrons. Various theoretical approaches which are being taken in the physics of the nucleon-antinucleon interaction are discussed and compared. The outlook for further research in antiproton beams is outlined.