In this issue, we learn more about how populations grow, change and move, and why understanding them is so important.
Depression is a common mental health condition affecting more than 1 in 10 people in the UK, yet it is still often misunderstood. What do scientists think is happening in the brain? How is it treated? Will you get it? Charlotte Ham compiles this Q&A to help us understand more about the condition.
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Each issue of 'Big Picture' comes with a sprinkling of Fast Facts, fascinating snippets of information on the topic covered.