Signs are placed on the outside doors of city hall to advise visitors that the library as well as a restroom are closed because of meth contamination in the south Denver suburb of Englewood, Colo.
Lindsay Cristides, a master's student in oceanography at Texas A&M University, anchors a research vessel in the Houston Ship Channel before taking samples of sediment left behind by Hurricane Harvey floods. The samples will be tested for contaminants including heavy metals.
Earlier this week, NIH temporarily halted work in the cell therapy lab of Dr. Steven Rosenberg, chief of surgery at the National Cancer Institute, pending a review of safety standards there.
Courtesy of National Cancer Institute