what have students learn from the optical spectrometry application in medicine?

Please help me with 1 through 3, please.    1) In one or two sentences, restate the title of the paper in a way that would be understandable to a member of the general public without a scientific background. And when was the paper published as well as who funded the research? 2) Look at the citation at the beginning of the paper. Who is the first author of the paper?  And does this have any significance?  3)  Read the paper’s Abstract.  Summarize the main point of the study in two or three sentences.  (Make sure you use your own words).

The experiment file says "Fill a cuvette with water and blank the spectrophotometer." What are we doing when we do this? Why is this step important