New York Times Corrections: “An article on Wednesday about the phrase “Collyers’ Mansion,” used to refer to a dangerously cluttered dwelling, misstated the authenticity of an artifact found in the Collyer brothers’ Harlem brownstone, the jam-packed building that spawned the term now often used by firefighters. Although some of the artifacts recovered, like musical instruments, were determined to be fakes, a two-headed baby in a jar of formaldehyde found in the house was actually real.”