Big Data will affect 21st-century science in a big way. Scientists now confront several new realities -- and Big Data is critical. Because more scientific data can be gathered than can be adequately analyzed by scientists, citizen science and Science 2.0 attempt to confront the data tsunami and solve the Big Data problem. Consider the Hubble Space Telescope. First carried into orbit by the NASA space shuttle program in 1990, the telescope continues to capture extremely sharp images of the universe and send that data back to Earth. Citizen science has taken off in recent years in ways that are redefining roles and working to provide the means to deal with Big Data and with global/local issues that otherwise seem to defy easy solutions. Citizen science, Science 2.0 -- and potentially Extreme Citizen Science as well -- all share the goals of discovery and enhancement based on new models of engagement with the public, fellow scientists, and others.
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