In a recent issue of Nature Synthesis, Anastasaki and colleagues report the discovery that acids can catalyze the initiation process of radical polymerizations and exemplify advanced control over polymer architecture during reversible deactivation polymerization. In a recent issue of Nature Synthesis, Anastasaki and colleagues report the discovery that acids can catalyze the initiation process of radical polymerizations and exemplify advanced control over polymer architecture during reversible deactivation polymerization.