Back Cover: Single‐Nanoparticle Cell Barcoding by Tunable FRET from Lanthanides to Quantum Dots (Angew. Chem. Int. Ed. 41/2018)

Arts and science Inspired by Dali's “The Persistence of Memory”, the three clocks in the picture perfectly represent the idea of this study, with three temporal optical detection windows that were used for RGB (red, green, blue) encoding. Shown is a single‐nanoparticle assembly (orange clock covered by ants in the original) on the bottom left, a microscope objective (the “monster” in the original) in the center (below the blue clock), and a microscope slide with red, green, and blue cells (the platform or pool in the original) on the top left. Find out more in the Communication by L. Huang, N. Hildebrandt et al. on page 13686 ff.