AM-FM Mode images of dissipation (left) and elastic modulus (right) for mouse prion amyloid fibrils on a polystyrene (PS) substrate with a (LDPE) low-density polyethylene domain. Values for Young?s modulus in the image and histogram (far right) were obtained by referencing to the PS-LDPE substrate. The dissipative signal shows greater contrast between the fibrils and the substrate than the elastic modulus. Imaged with the Cypher S, 3 ?m scan size. For more information see G. Lamour, K.C. Yip, H. Li, and J. Gsponer, ACS Nano 8, 3851 (2014).