Cerium fragment Intermediate 02/13/2014 Bismuth crystal Intermediate 02/13/2014 Mystic mountain in the Carina Nebula Intermediate 01/13/2014 Crystals of vitamin C Advanced 11/15/2013 Distillation Set-Up - Unlabeled Intermediate 08/07/2013 Distillation Set-Up - Labeled Intermediate 08/07/2013 Noble Gases Spectrum Intermediate 07/12/2012 Gas Discharge Tube Spectrum Beginner 07/12/2012 Oxygen Beginner 07/12/2012 Nitrogen Beginner 07/12/2012