Noel Kirkpatrick of MNN points to a new studythat confirms they were right; as Supreme Court Justice Louis Brandeis noted, sunlight really is the best disinfectant. The researchers of the study, Daylight exposure modulates bacterial communities associated with household dust, built little model rooms with little model windows and then "inoculated them with dust collected from residential homes in Eugene, OR, USA." The windows were variously clear glass, UV blocking glass, UV transmitting glass, or a solid aluminum plate.