John Henry Holland, a computer scientist who developed codes that mimicked evolutionary processes, has died, the New York Times reports. He was 86.

While at the University of Michigan as a graduate student, Holland happened upon a book by statistician and evolutionary biologist R. A. Fisher that showed that biological systems, including how a colony of butterflies moved, could be described mathematically.

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Lawmakers have asked four direct-to-consumer genetic testing companies to explain their privacy policies and security measures, according to Stat News.

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