sciences

L'ère de la vie évoluée, qui a commencé il y a seulement 600 millions d'années, est déjà sur le déclin. Le gaz carbonique se raréfie dans l'atmosphère. Voyage dans le futur : la mort de la Terre en images | Rue89

Conflict History | 1168-1185

C'est probablement pour cela que Jean-Luc Marion, professeur à la Sorbonne, déclare dans Le Point que « la question, purement anecdotique, n'a aucun intérêt ». A tout cela s'ajoute que des documents importants pour l'éclaircissement de ce problème n'ont pas été publiés dans l'édition des Œuvres de Descartes par Adam et Tannery (reéditée par Costabel et al.). "Il y a des preuves que René Descartes a été assassiné" | Rue89

Le retour de Dieu ? - La vie des idées Les temps changent.

Actualité > Olympus Mons, un géant martien Par Jean-Baptiste Feldmann, Futura-Sciences

New human species found in Siberia | Science | The Guardian The first humans to move from Africa to Eurasia were Homo erectus 1.9m years ago, but scientists believed they died out around 100,000 years ago.

New Australopithecus fossil may be a human ancestor Science has produced an accompanying news article that includes thoughts from a number of people who study human origins, and it seems there's disagreement over whether the authors are even correct to assign this species to Australopithecus ; a significant group of researchers are quoted as saying it actually belongs among the Homo . Others accept the authors' opinion here, while at least one points out that the Homo -like features are largely apparent in the juvenile skeleton, and suggests the similarities would be less pronounced as it matured. If that were the case, the skeletons might represent the well known Australopithecus africanus .

Universe’s age: 13.75 billion years Marshall says several groups are working on extending this research, both by finding new systems and further examining known lenses. Researchers are already aware of more than twenty other astronomical systems suitable for analysis with gravitational lensing. This research was supported in part by the Department of Energy Office of Science.

Le blog Sciences du Monde.fr révèle cette nouvelle étonnante: le séisme qui s'est déroulé au Chili le 27 février était d'une telle puissance qu'il a légèrement modifié la période de rotation de la Terre et donc la durée d'une journée. «Après que la Terre a tremblé au Chili, dans la nuit de vendredi à samedi, les jours terrestres ont raccourci.» Le blog se rapporte aux estimations d'un chercheur d'un laboratoire de la Nasa et souligne que «le jour est désormais plus court de 1,26 microseconde». Le séisme du Chili a raccourci les jours | slate

How an Icelandic volcano helped spark the French Revolution | Wo Volcanologists at the Open University's department of earth sciences say the impact of the Laki eruptions had profound consequences. Dr John Murray said: "Volcanic eruptions can have significant effects on weather patterns for from two to four years, which in turn have social and economic consequences.

Les grenouilles loufoques d'Equateur | slate Vous souhaitez proposer un lien complémentaire sur ce sujet ou sur tout autre sujet d'actualité? Envoyez-le à infos @ slate.fr Image de une: capture d'écran du Guardian

Between 600 and 1,500 years ago, people in places like French Guyana overcame the challenges by building raised fields on the savannas. The fields were not plateaus, but instead constituted many oblong mounds that farmers could plant crops on to keep them safe from floods. This left "fossil" landscapes that archaeologists have been investigating. Several species carry a torch for ancient farms

PNAS , 2010. DOI: 10.1073/pnas.0912477107 ( About DOIs ). Greater mouse-eared bats are nocturnal and generally emerge from their roosts after the sun sinks below the horizon, but before the residual light in the sky disappears. Bats use the sun to orient flights through the dark

"Parks in Kenya were set aside in areas where people saw large aggregations of animals and typically these were the areas where animals congregated during the dry seasons," said Western. "They ignored seasonal migrations because people didn't know where these animals migrated to, in many cases." To protect elephants and other endangered species from poachers, the national parks confined these animals within park boundaries. National Parks in Kenya Not Insulated From Wildlife Declines

Climate Change Too Abstract For You? Dengue Fever Could Spread t Global warming is likely to increase the number of people at risk of dengue epidemics by expanding both the area suitable for the mosquito vectors and the length of dengue transmission season in temperate areas . By 2085, an estimated 5.2 billion people--more than 3 billion additional people worldwide--are projected to be at risk for dengue because of climate change-induced increases in humidity that contribute to the disease's spread, based on models that use observed relationships between weather patterns and dengue outbreaks.6 Researchers in Australia and New Zealand calculated that climate change is projected to increase the range and risk of dengue in these countries. According to their study, another 1.4 million Australians could be living in areas suitable for the dengue mosquito vector by 2050.