Every now and then we feature work that is shared in Hypergraph. You can choose to read it here or open it in Hypergraph (download Hypergraph here). Content suggestions can be sent to community@libscie.org. Cover image courtesy of CrossRef (CC-BY 4.0). The Digital Object Identifier (DOI) system is like a digital address book: One DOI name resolves to information on the location of the content.