A definitive or authoritative "essay" on does not exist because it is not an academic topic, a formal organization, or a verified educational resource.
"Quack" traditionally refers to fraudulent or unverified medical claims ("quackery"). However, in the ecosystem, "Quack" has been repurposed to mean Quality Unsupervised Adaptive Content Kinetics . It measures how well a learning module performs without proctor intervention. duckquackprepcpm new
Origins and Philosophy