The Lexend group was formed out of research on second grade students (US) [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3777945/ https://www.ncbi.nlm.nih.gov/pm

The Lexend group was formed out of research on second grade students (US) [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3777945/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3777945/] that lead them to a font design [https://design.google/library/lexend-readability/ https://design.google/library/lexend-readability/] that apparently showed improved reading proficiency. A 'world-script' version of the font family is also published as Readex Pro [https://github.com/ThomasJockin/readexpro https://github.com/ThomasJockin/readexpro]