The researchers believe that a child's contact with factors other than dog allergen, such as bacteria or other unknown factors, may provide the protective effect. (sciencedaily.com)
The remains of other unknown humans may be boxed away in storage, waiting to be added to our family tree. (discovermagazine.com)
Possibly as a result of the swelling or for other unknown reasons, the silicon fractures and breaks down. (pnnl.gov)