Hans Rosling founded the development organisation Gapminder. They are well-known for producing beautiful graphics such as this one, which shows global income per person in 1970. Each colour is a different continent. Image: gapminder, CC BY 4.0

Sean is a PhD student researching geophysical fluid dynamics at UCL. He studies coastal outflows, but so far has been unable to persuade the department to send him on a research trip to the beach.

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