February 2008: * 13th: Oxygen Debt * 23rd: Area of a triangle March 2008: * 16th: Oxbow lake * 27th: Adrenaline April 2008: * 18th: Hydro-electric energy May 2008: * 23rd: Thermoregulation July 2008: * 5th: Acid February 2009: * 3rd: Transformer
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