May 2, 2011
arsenic is an ingredient in cigarettes

arsenic is an ingredient in cigarettes

March 26, 2011
noble gases in gas discharge tubes

noble gases in gas discharge tubes

March 25, 2011
gold crystals

gold crystals

March 23, 2011
native copper

native copper

March 12, 2011
bismuth crystals

bismuth crystals

March 9, 2011

March 7, 2011
cesium crystals

cesium crystals