title: Mysterious contamination explained.
authors.affiliation: Penn State College of Medicine , USA. sking@psu.edu
authors.forename: Steven H
authors.initials: SH
authors.lastname: King
authors.forename: Michael C
authors.initials: MC
authors.lastname: Erdman
mesh_terms: D016902:Air Pollution, Indoor; D000398:Air Pollution, Radioactive; D006283:Health Physics; D006801:Humans; D007753:Laboratories; D008297:Male; D013337:Students, Medical