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When the brain encodes memories as positive or negative, one molecule determines which way they will go.

Eric Larson and Isabel Vogt have solved the interpolation problem — a centuries-old question about some of the most basic objects in geometry. Some credit goes to the chalkboard in their living room.

The key to understanding the origin and fate of the universe may be a more complete understanding of the vacuum.

Partnerships between engineers and biologists have begun to reveal how birds evolved their superb maneuverability.

Structural studies of the robust material called sporopollenin reveal how it made plants hardy enough to reproduce on dry land.

Protein buildups like those seen around neurons in Alzheimer’s, Parkinson’s and other brain diseases occur in all aging cells, a new study suggests. Learning their significance may reveal new strategies for treating age-related diseases.

Neuroscientists uncovered an energy-saving mode in vision-system neurons that works at the cost of being able to see fine-grained details.

Computer scientists can now solve a decades-old problem in practically the time it takes to write it down.

Jared Duker Lichtman, 26, has proved a longstanding conjecture relating prime numbers to a broad class of “primitive” sets. To his adviser, it came as a “complete shock.”