Clouds with extremely cool water are mixed with man-made ice crystals, such as silver iodide and metaldehyde crystals.

VOA: special.2011.01.11

"If we are right about silver."

VOA: special.2010.07.01

The executive producers are Joel Silver and Guillermo del Toro, two filmmakers known for their success in the thriller genre.

VOA: standard.2010.06.09

There are two types of Asian Carp in the Illinois River - bighead and silver.

VOA: standard.2010.07.20

The gold medals are mostly silver. But each is plated with six grams of gold.

VOA: standard.2010.02.16

The silver medals are almost entirely made of silver.

VOA: standard.2010.02.16