May 2, 2011
arsenic is an ingredient in cigarettes

arsenic is an ingredient in cigarettes

6:33am
(Notes: 84)
  
Filed under: science cigarette cigarettes arsenic chemistry elements 
March 26, 2011
noble gases in gas discharge tubes

noble gases in gas discharge tubes

10:55am
(Notes: 430)
  
Filed under: helium neon argon krypton xenon noble gases chemistry elements science tech 
March 25, 2011
gold crystals

gold crystals

9:49pm
(Notes: 132)
  
Filed under: gold gold crystals crystals elements chemistry science 
March 23, 2011
native copper

native copper

5:28pm
(Notes: 46)
  
Filed under: science chemistry elements geology native copper copper 
March 12, 2011
bismuth crystals

bismuth crystals

12:43pm
(Notes: 556)
  
Filed under: science chemistry bismuth elements crystals 
March 9, 2011

7:35pm
(Notes: 148)
  
Filed under: science chemistry elements mercury 
March 7, 2011
cesium crystals

cesium crystals

5:52am
(Notes: 226)
  
Filed under: science chemistry cesium crystals elements