The carbon-fluorine single bond is among the strongest known and results in PFA being virtually chemically insert and nonwettable by fluids such as water.
Where Victor Gruen simply used a hunch to invent window shopping virtually any store from IKEA to your local grocery has a trove of big data at their fingertips.
So for lexical resource, you'll have to make sure that your essay is virtually error-free and that you used a wide range of vocabulary in a natural and formal way.