Cover Picture: Ann. Phys. 7'2013

Precision measurements probing nature's fundamental interactions help physicists to address the great challenges they face, such as finding and verifying a theory beyond the Standard Model of particle physics that might, ultimately, unify gravity and quantum mechanics. In two volumes of Annalen der Physik a series of articles will address current precision efforts investigating fundamental interactions and their properties at lowest energies. The cover picture shows an example of an ion trap, here in particular a Penning trap that can be employed tomeasure the mass of exotic isotopes to high precision. Photo: The TITAN mass measurements trap (with permission from M. Hapke, TRIUMF).