Algal culture with different cell density, varying from light green to dark green and black.(Xinyue Liu / Department of Chemical Engineering and Materials Science)Algae can be used for sustainable products, but you need enough of it — enough biomass — to do so. Researchers at Michigan State University say they've developed a way to more evenly distribute sunlight in algae cultivation systems, which leads to more algae growth.Xinyue Liu is a co-a…