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.
When it comes to vaccinations, personal choice and public safety may clash. In this debating activity, students discuss the pros and cons of making childhood vaccination compulsory and think about the reasons why parents may have different opinions over what they should do for their children.
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Each issue of 'Big Picture' comes with a sprinkling of Fast Facts, fascinating snippets of information on the topic covered.