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Tracking the spread of Covid-19

This article tracks the early stages of the global diffusion of the Covid-19 pandemic, and assesses its rate of spread through the Worldwide Air Transportation Network (WAN)

Figure 1 Time taken for successive pandemics of influenza to diffuse across Europe, 1700–2020

■ OCR: Disease dilemmas

■ AQA: Population and the environment

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What are exams for anyway?

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Groundwater abstraction

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