Heavy-ion cooler and storage rings offer a rich field of new and unique possibilities to study nuclear structure. Cooling creates beams of high phase space density for high-resolution experiments. In first experiments atomic masses of more than hundred new nuclides were measured with high precision. Future experiments with cooled energetic beams of exotic nuclei allow high precision nuclear structure studies in direct reactions such as (d, p), (p, p'), or Coulomb breakup. The extension of these investigations to electron scattering in a heavy-ion-electron collider will be discussed.