The inside cover picture shows how the eco-friendly combination of an iron salt as catalyst, aqueous hydrogen peroxide as oxidant, and ultrasound as activation method leads to the selective oxidation of D-glucose into gluconic acid. Indeed, gluconic acid is an attractive target for industry, essentially produced through biotechnological processes. D. Rinsant, G. Chatel, and F. Jérôme demonstrated a sono-Fenton effect and estimated the production of HO⋅ radicals involved in the oxidation reaction. This work is an example of great opportunities that the sonochemical activation can offer in catalysis, involving eco-efficient processes. The article highlighted by this cover can be found on p. 3355 ff. of Issue 12, 2014.