Lean startup from Eric Ries' book says that the build-measure-learn loop is a way to put your product out there upfront and have it tested against actionable metrics and with real users (early adopters, at this stage). It tells you to have a minimum viable product designed with acceptable flaws but that serves to measure a certain hypotesis of value or growth. I tried to google around some startups in the materials engineering and science field, and Ries even cites one in his book. What I did not found (or thought of) is how to transpose his principles to startups dealing with materials. I myself am starting one and I find it tricky to tweak my material to have certain properties as an MVP. Does anyone have expertise in this field? How do you have your product tested? Do you ship free samples to potential customers? Do you put up a fake e-commerce just to track customer clicks and advertise the website?