Pieces of the silver treasure that belonged to the legendary Danish King Harald Bluetooth, who brought Christianity to Denmark and whose name inspired modern Bluetooth technology. Credit: Stefan Sauer/AFP/Getty A medieval treasure trove that belonged to the legendary King Harald Bluetooth — the Danish ruler who inspired the name for […]

The structure of ZIF-62, ( zinc imidazolate, benzimidazolate) showing the tetrahedral structure in two dimensions. Credit: Ang Qiao, Penn State Lightning and volcanos both produce glass, and humans have been making glass from silicon dioxide since prehistory. Industrialization brought us boron-based glasses, polymer glasses and metallic glasses, but now an […]

Earlier reports based on satellite data suggested that the Danger Islands could be home to several penguin “supercolonies.” However, heavy pack ice is common around the Danger Islands, even in austral summer, making difficult to access this area to conduct a comprehensive survey. Credit: Rachael Herman, Louisiana State University For […]