  We discuss recent work on Coulomb dissociation and an effective-range theory
of low-lying electromagnetic strength of halo nuclei. We propose to study
Coulomb dissociation of a halo nucleus bound by a zero-range potential as a
homework problem. We study the transition from stripping to bound and unbound
states and point out in this context that the Trojan-Horse method is a suitable
tool to investigate subthreshold resonances.
