Explore how our bodies are designed to prevent potentially harmful objects from getting inside, and what happens when foreign organisms or substances breach these barriers.
Rheumatoid arthritis is a debilitating and painful condition that affects some 400,000 people in the UK. But it’s not just a disease of ageing. In this three-minute video, meet young mum Charlotte who explains how severe arthritis affects her life.
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Each issue of 'Big Picture' comes with a sprinkling of Fast Facts, fascinating snippets of information on the topic covered.