A technique based on genetic bar codes can easily map the connections of individual brain cells in unprecedented numbers. Unexpected complexity in the visual system is only the first secret it has revealed.
About the author
Monique Brouillette is a freelance writer based in the Boston area who reports on synthetic biology, neuroscience, health and other topics. Her work has appeared in publications such as Scientific American, Science, Technology Review, New Scientist and Motherboard.
