Scholars argue that "witch's circles" in Namibia, which remains one of the most important puzzles of biology that arise due to self-organization of grass. This hypothesis Gettin Stefan (Stephan Getzin) and his colleagues proved based on the similar phenomenon discovered in Western Australia.
Scientists say that "vedminy circles" in Namibia, which remains one of the most important puzzles of biology that arise due to self-organization of grass. This hypothesis was proved based on the similar phenomenon discovered in Western Australia. About the discovery reported in the journal Proceedings of the National Academy of Sciences.
Namibian "witch's circles" are located approximately the same distance from each other, the circles of bare soil surrounded by grasses. These formations are found in arid areas of the country, and scientists continue to argue about their nature.
Stefan Getzin (Stephan Getzin) and his colleagues found similar spatial patterns in one of the areas of Australia — all the circles inherent in the placement of the hexagons in the scale of less than 50 meters, as well as uniform distribution in space over large scales. Contrary to the main theory of the origin of the "strong circles", linking them to the activities of termites, the researchers found that in Australia they arise through self-organization.
Field research, remote survey, mathematical and spatial modeling indicated a positive feedback between biomass and precipitation. According to scientists, the theory of logical forms (patterns) in nature, precisely describes how the movement of water in dryland ecosystems. Precipitation falling on the lawns, flowing down to the surrounding grass and stimulate even more growth — which ultimately leads to the reproduction of structures. This process does not depend on grass species composition and soil type.
In Namibia (as well as some parts of Angola and South Africa) vedminy circles are found in areas with minimum species diversity in Namibia notice them among the plants of the genus Stipagrostis. Until recently, the most influential hypothesis to explain the origin of the "strong circles", was considered to be thermite. Its proponents argue that the termites Psammotermes allocerus are trying to create a favourable environment.
U.S. military aircraft, which was carrying 11 people, crashed in the Pacific ocean. The aircraft was headed to the aircraft carrier Ronald Reagan, Fox News reports.
December 2 "
The police asks to respond witnesses of the accident, which occurred on November 15, 19.31 Stopanska the edge, at the 12th km of the road Riga