Scientific data sharing has become big news in the wake of the theft of e-mails from the Climatic Research Unit and ensuing investigations. Although the CRU researchers appear to have had an attitude towards data sharing that breached generally accepted scientific ethics, the process of actually sharing the data would have been anything but straightforward. The CRU had no procedures in place for data sharing, the data came from a variety of sources with no standardized data format, it was a mix of published and proprietary information, etc. In short, it's one thing to decide to share the data, another challenge entirely to actually do so.

You can contrast this with NASA, which has procedures in place for sharing data and a standard policy for publishing it. But, according to a report produced by Nature News, the agency may only be sharing a deliberately limited version of the data from its planet hunting probe, Kepler. 

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