| http://www.w3.org/ns/prov#value | - That???s what this technology does.??? Reiss said the technology detects ???low density??? compounds such as drugs and humans ??? which are mostly made of carbon, hydrogen and oxygen and easier for an x-ray to pick up ??? as opposed to ???high density??? compounds such as steel.Weapons ??? which are sometimes made of dense metals ??? may be more difficult to detect, although the machine can be con
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