Contents: (Small 34/2015)

and co-workers show a 3D visualization of electron tomography measurements made on gold nanoparticles formed by seeded growth on gold nanostars, capped with a mixture of dithiols and cationic surfactants.On page 4314, this particular surface chemistry directs gold shell growth into unusual morphologies containing internal gaps, which can be applied as intrinsic hot spots for SERS applications such as sensing or imaging.The image background displays a cross-sectional view of an encapsulated nanostar, where the internal gaps are clearly visible. Drug DeliveryA smart, tumor-trigged, controlled drug release using inorganic "caps" with CO 3 2functional groups in electrospun fi bers is reported by W. Cui and co-workers on page 4284 to inhibit cancer relapse.When the drug-loaded intelligent electrospun fi bers encounter pathological acidic environments, the inorganic gates will react with the acids and produce CO 2 gas, which enables water penetration into the core of the fi bers to induce rapid drug release. PrintingElectrohydrodynamic jet printing is an additive fabrication approach that enables direct patterning of materials in liquid form with nanoscale resolution.This approach presents opportunities for further research with strong potential of applications in various fi elds such as printed electronics, tissue engineering, and photonic devices.On page 4237, M. S. Onses, J. A. Rogers and co-workers review the recent progress in this fi eld, ranging from the underlying processes of jet formation and droplet generation, to engineering systems for controlled, high-speed printing, functional materials for inks, and practically achievable resolution, all in the context of diverse applications.