Three instances are discussed in which results produced by chiral perturbation theory can be reliably pushed to high space-like values of transferred momenta: 1. nuclear interactions, 2. nucleon sigma-term and 3. space-like structure of the pion
An effective $SU(3)times SU(3)$ chiral lagrangian, which includes scalar resonances, is used to describe the process $D^+ rar K^- p^+ p^+$ at low-energies. Our main result is a set of five $S$-wave amplitudes, suited to be used in analyses of production data.
A discussion is presented of the dynamics underlying three-body nuclear forces, with emphasis on changes which occurred over several decades.
Chiral expansions of the two-pion exchange components of both two- and three-nucleon forces are reviewed and a discussion is made of the predicted pattern of hierarchies. The strength of the scalar-isoscalar central potential is found to be too large
and to defy expectations from the symmetry. The causes of this effect can be understood by studying the nucleon scalar form factor.
