Acknowledgements

	Wikipedia for Schools, http://schools-wikipedia.org.
	www.scienceworld.ca
	www.tessafrica.net, Tessa Open educational resources for teacher education in Africa
	www.e-learningforkids.org, Opening Doors to Education Worldwide
	www.msnucleus.org, Joice Blueford
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	www.khms.ac.in / Kulachi Hansraj model school India
	www.sheppardsoftware.com
	www.educationworld.com
	amazingbiology.ning.com, Monika Mehan, biology secundary level, enviroclub ning.com