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...system. But when they aren't, microbes also help us to fight back. Bacteria cause disease when they are able to reproduce in the body. They produce harmful substances called toxins, which damage tissues and organs. But in nature, microbes can also produce agents called antibiotics to protect themselves against competitors. PROFESSOR CHARLES COCKELL: It's a tough world out...

...thinking about the future...[Photograph of Moraine lake, Alberta. The photo shows a blue-green expanse of lake water, with dense forest on the left, and rocky mountainous terrain to the right of the lake.] Climate change is one of the greatest challenges we face as a society, but it can be a difficult subject to approach. Not only can the science seem dauntingly complex,...

...the particular arrangement meets with your objective. If you are stuck or lose the thread, start again with a new central theme and create a new, perhaps subsidiary, diagram. Don’t clutter up the original. You could perhaps just leave things for a while to give you time for some fresh thinking. References Buzan, A. (1974) Use your head, London, UK, BBC Publications....