New claim staked for metallic hydrogen
Some experts doubt report of creating elusive material
![hydrogen under pressure](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/01/012517_ec_hydrogen_free.jpg?fit=860%2C460&ssl=1)
TIGHT SQUEEZE As scientists pressed hydrogen between two diamonds, it changed from transparent (left) to black (middle) and, finally, to a reflective state (right). That reflectivity indicates that the hydrogen transformed into a metal, researchers claim.
Ranga Dias, I.F. Silvera