Nature. 542(7639):17, FEBRUARY 2ND, 2017 DOI: 10.1038/nature.2017.21379 , PMID: 28150796 Issn Print: 0028-0836 Publication Date: February 2nd, 2017 Print Physicists doubt bold report of metallic hydrogen Davide Castelvecchi; + Author Information Davide joined Nature in December 2012. Previously he has been an editor at Scientific American and a physical sciences reporter at Science News. He has degrees in mathematics and in science writing. Checking for direct PDF access through Ovid Abstract Many researchers are sceptical of a paper claiming to have compressed hydrogen to a metallic state.