Scientists map a fly's entire brain (On a roll)
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**Today's story: **Scientists have completed a ""connectome"" of an adult fruit fly, mapping all 140,000 brain cells and the 55 million connections between them. The map will allow scientists to study in much greater detail how a brain works. And the complete connectome of the fruit fly may pave the way for mapping larger, more complex brains, including those of mice and, potentially, humans.

Learn this English expression: 'On a roll' means experiencing a series of successes or feeling confident and energized.

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