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...think someone should respond to loss. Psychiatrist William Worden would argue that grief is a process to be worked through and others such as the sociologist Christine Valentine would argue that there is no timetable for grief and a bereaved individual will find ways to continue a bond with those who have died. I know many people do this by remembering the person in a...

...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...