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...writing, either as commentary or as speech bubbles, although some will help explain the diagram to other people. Guidelines A rich picture is an attempt to assemble everything that might be relevant to a complex situation. You should somehow represent every observation that occurs to you or that you gleaned from your initial exploration. Fall back on words only where...

...Writing at the time of another high-profile death in which the element was implicated, Martin Boland explains what polonium is, and what makes it deadly...Find out more about The Open University's BSc (Honours) Chemistry qualification. A Swiss forensic report of the exhumed remains of ex-Palestinian leader Yasser Arafat today suggests polonium poisoning may have been the...

...writing in 2006] they were not covered by US Clean Air legislation. The rate of emissions has been increasing; there was a 10% increase in the USA from 2001 to 2002, and, in countries such as China and India, whose rapidly expanding economies are heavily dependent on fossil fuels, emissions are predicted to increase even faster). The effects of mercury pollution will be...