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...system and how the body uses the elements in our food to function. It is important to understand the macro and micro nutrients in the foods we eat and how our bodies use them. Some people follow food restriction due to choice or religious observation. Malnutrition is not just a concern for developing countries – it can mean over nutrition as well as under nutrition....

...systems. Babatunde Osotimehin, executive director and under-secretary-general of the United Nations, tells SciDev.Net that governments and all partners in reproductive health need to provide information and access to voluntary family planning to all people of reproductive age. “These will enable both women and men to make informed decisions about their reproductive...

...systems. Converging (convex) lenses and converging (concave) mirrors each cause parallel rays of light to come together at the focal point, or focus, of the lens or mirror as shown below. In contrast, diverging (concave) lenses and diverging (convex) mirrors each cause parallel rays of light to spread out as if emanating from the focal point situated at a distance of one...