Before a spectrometer can do any useful work, it needs to be calibrated to identify wavelengths correctly. This is usually done by detecting several characteristic peaks or dips in a well-known ...
Olga González, a gemologist and communications strategist, examines the urgent global challenge of mercury pollution in ...
By Christabel Danso ABEAMAirborne mercury levels in some small-scale mining communities across Ghana have risen to alarming levels – more than 150 times higher than global safety limits, according to ...