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An efficient synthetic method for the production of stabilized cyclo-olefin polymer (COP) latexes catalyzed by a well-defined ruthenium carbene catalyst in aqueous solution is reported by Hoang The Ban, Masahiro Shigeta, Tsutomu Nagamune, and Mitsugu Uejima on page 4584. The COP latexes exhibit an exceptionally high compatibility with well-dispersed carbon nanotubes (CNTs) in aqueous solution due to strong π[BOND]π interactions between the graphitic surfaces of the CNTs with the C[DOUBLE BOND]C bonds located on the COP main chains. Accordingly, a binary blending of these two well-dispersed colloidal systems in aqueous solution leads to the fabrication of highly homogeneous COP/CNT composite nanoparticles that possess high electrical conductivities due to the presence of uniformly CNT-based networks made from individually interconnected CNTs deposited on the interface of COP nanoparticles as observed in the cover image.