Number 15 (Story #1), January 3, 1991 by Phillip F. Schewe and Ben Stein THE CASE FOR METALLIC HYDROGEN remains problematic. A group at Harvard (Isaac Silvera, 617-495-9075) studied the optical absorption and reflectance properties of a sample of molecular hydrogen at pressures up to 230 GPa (2.3 Mbar) and over a temperature range of 77-295 K and found no evidence for metallization. In the past two years, scientists have seen hints for phase changes in hydrogen (such as a darkening color) at high pressures but so far no one has observed an unambiguous insulator-to-metal transition. (Upcoming article in Physical Review Letters.)