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Involving members of the public can help science projects — but researchers should consider what they want to achieve. Equipped with smartphones, computers and do-it-yourself sampling kits, lay volunteers are tweeting about snowfall, questing for comets and measuring the microbes in their guts. They are part of a growing group of 'citizen scientists', networks of non-scientists who help to analyse or collect data as part of a researcher-led project. They learn about science and get a chance to participate, but the scientists involved stand to gain too. There are indications that in the past five years or so, citizen science has become more popular with researchers — and more likely to translate into a legitimate, publishable research project. It offers a means of doing substantial, thoughtful public outreach, and of tackling otherwise intractable, laborious or costly research problems.
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