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Iona Twaddell looks at the science of the waterborne disease cholera There are an estimated 3-5 million cases of cholera, a disease caused by the bacterium Vibrio cholera, each year. It is passed on through drinking water that has been contaminated with faeces from someone infected with the bacteria. Cholera causes vomiting and diarrhoea, leading to severe dehydration.

Annenberg Learner on content literacy; 10 step interactive website. 1) what is disciplinary literacy 2) Big Ideas 3) Reading 4) Writing 5) Content Specific Big Ideas in Literacy 6) Reading in Content Area (Science) 7) Writing in Sciene 8) Bringing it all together