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A new book describes how cutting-edge genomics techniques yielded “extraordinary proof” that Thomas Jefferson fathered children with Sally Hemings.

A bipartisan group in Congress and Gov. Gavin Newsom of California have floated ideas for building a mechanism that would instantly power down an A.I. system. Only no one really knows how.

Dog behavior experts offered a variety of explanations for why Nash the golden retriever wagged his tail and carried a toy near a man who broke into his owner’s home.

Maintenance projects have been put off around the country and resources diverted to the president’s favored projects in Washington.

The species, called a tilcayo, is smaller than a house cat and lives in the cloud forests of the Andes Mountains in Bolivia.

The discovery of “hypersoft” X-ray beacons could help solve some mysteries about the universe.

Nearly 1,000 readers sent us their questions about artificial intelligence, its potential and its potential risks.

The gene is found predominantly in Southern Appalachia and may be one of the most powerful cancer-risk mutations ever found.

Scientists have discovered a powerful gene-targeting system in viruses. Billions of years old, VIPR seems to predate CRISPR and may be even more effective.

The Democratic candidate for governor backed restrictions on disposal of fracking wastewater around a hard-hit town, and called for a “thorough investigation” of the dangers.