AUTHOR=Pugno Nicola Maria TITLE=Frontiers in Materials Has the Ambition of Taking Up the “Grand Challenge” of Following Leonardo da Vinci's Legacy JOURNAL=Frontiers in Materials VOLUME=6 YEAR=2019 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2019.00333 DOI=10.3389/fmats.2019.00333 ISSN=2296-8016