A mathematician found the most efficient way to fold paper into a doughnutlike shape.

The debate could reopen in 2030 when NASA’s Europa Clipper spacecraft gets the closest view of the icy moon’s surface.

Lab experiments suggest mosquitoes can smell DEET and learn to associate it with food, but it’s unclear whether that happens in the wild.

How animals navigate by Earth's magnetic field is hotly debated. New research in pigeons points to iron-laden liver immune cells as the compass.

The new test may catch active tuberculosis in those with low access to health care or who have trouble making the phlegm needed for traditional tests.