Threats to Bio-weapons Protocol

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Scientists and medics in London discuss threats to the international bio-weapons protocol. Ancient pollen from Mexico helps trace the origins of maize back 7,000 years. A cellophane and sugar sachet that can easily purify drinking water is performing well in trials. Exhibition of post-Apartheid South African scientific inventions, including an open-frame X-ray machine, and the prospect of diamond coating for almost any hard surface.