- PhysOrg
- 20/3/7 17:37
The rare Tiehm's buckwheat stands less than a foot tall (30 centimeters) in Nevada's rocky high desert, its thin, leafless stems adorned with tiny yellow flowers in spring.
The rare Tiehm's buckwheat stands less than a foot tall (30 centimeters) in Nevada's rocky high desert, its thin, leafless stems adorned with tiny yellow flowers in spring.
Before the Taqba Dam impounded the Euphrates River in northern Syria in the 1970s, an archaeological site named Abu Hureyra bore witness to the moment ancient nomadic people first settled down and started cultivating crops. A large mound marks the settlement, which now lies under Lake Assad.
A new NASA/university study of carbon dioxide emissions for 20 major cities around the world provides the first direct, satellite-based evidence that as a city's population density increases, the carbon dioxide it emits per person declines, with some notable exceptions. The study also demonstrates how satellite measurements of this powerful greenhouse gas can give fast-growing cities new tools to...
Two factors that control the expression of a key gene required by luminescent bacteria to kill competing bacterial cells have been identified. The finding, by researchers at Penn State, sheds light on the molecular mechanisms that enable different strains of bacteria to compete and establish symbiosis in the Hawaiian bobtail squid. Consequently, the study, which appears online in the Journal of...
Extreme temperature can do strange things to metals. In severe heat, iron ceases to be magnetic. In devastating cold, lead becomes a superconductor.