Nitrogen isotopes show how nutrients leach out of septic tanks and into pond ecosystems.
Many of the boys in the choir had tics, leading the scientists to speculate that the repetitive movements may be related to motor learning.
An exceptionally strong El Niño may have caused 1876-1878 famine that killed tens of millions.
Even some of the most powerful explosions in the universe might be explained by the collision of magnetic fields.
People who eat fish from glacial meltwater may be at risk from persistent organic pollutants produced in the 20th century.
Sediment core from a Copenhagen lake tells the story of the Industrial Revolution.