Cover: The cover image presents the significant increase in molecules that can be anchored into the porous structure of a metal nanoparticle surface using interface modification. The anchored molecules are circled in the images, and they act to bridge the particles with the matrix. This improves matrix fracture toughness while posing no effect on radiation-shielding performance. Further details can be found in the article by J. Ma, L. T. B. La, I. Zaman, Q. Meng, L. Luong, D. Ogilvie, and H.-C. Kuan* on page 465.