Californium, a metal first synthesized in 1950, is the world's most expensive material due to its extreme rarity and its applications in medicine, industry and security. The metal, first synthesized ...

The list includes: Californium is the most expensive metal ... with prices ranging between $1 to $5 per gram. The world of ...

The sample had secrets of its own — a new, rare metal previously unknown to science. Today, it's the most valuable precious metal on the planet: rhodium, a chemical element with the symbol Rh and ...

The sample had secrets of its own — a new, rare metal previously unknown to science. Today, it's the most valuable precious metal on the planet: rhodium, a chemical element with the symbol Rh ...