Lake Spechtensee Beginner 10/01/2015 Seljalandsfoss waterfall Beginner 09/21/2015 Element Infographics – The Actinides Intermediate 09/14/2015 Element Infographics – The Lanthanides Intermediate 09/14/2015 Element Infographics – Transition Metals Intermediate 09/14/2015 Element Infographics – Group 1 Intermediate 09/11/2015 Element Infographics – Group 2 Intermediate 09/11/2015 Fluoride & Water Fluoridation Advanced 09/11/2015 The Chemistry of Sparklers Advanced 09/10/2015 European Holly Beginner 09/09/2015