Galaxyzoo.org asks volunteers to classify galaxies according to shape. The “greatest discovery to date”: A 24-year-old Dutch schoolteacher spotted a never-before-seen astronomical object that is now the subject of two peer-reviewed articles.

www.windows.ucar.edu/citizen_science/budburst/, home to a plant-phenology program known as BudBurst, asks citizens to “keep tabs” on plants’ life cycles. When flowers bloom or leaves turn, they report changes to climatologists to determine the effects of seasonal variations in climate.

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