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Browse the full archive below by year and month, or jump to a section: Health, Brain, Technology, Earth, Space.

About this archive: Science Blog has published since 2002, and this archive reflects different owners, contributors and editorial systems. An older article’s original publication date does not mean it has been reviewed under our current process.

Where we materially revise an article, we add an update or correction note and show the date of that work. Administrative migrations do not count as editorial updates.