I need a couple of ideas. For the project we are supposed to test out an idea for biotechnology product that is innovative. However, it's just 2 pages, meaning that we can't "develop" something and thus it can include a lot of assumptions. Our choices include biologic therapy, biomaterials, and biomarkers or green biotech etc.

I want to do something similar to contact lenses or pacemakers. Instead of having an approach including an animal model (which is what the professor suggested, thus most of the reports are going to have that) I want to use physics and math coupled with biotechnology with my product. So to show the product is successful first I'll have a bunch of physics applied to it in the theory and then I have to find a testing method. Which is what I need help with. A few suggestions for the product (no, you don't have to give me details or anything, just help me out because the only thing I can think of is contact lenses and I want to take it a bit further than that) and I can figure out the testing method.

how much NaCl is needed to make 1000 mL of 5 mg/mL solution ? please show steps