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Brésil, 2018

Bannière

Titre
Exclusive - Brazil’s Top Prosecutors Who Indicted Lula Schemed in Secret Messages to Prevent His Party From Winning 2018 Election
Auteurs
  • Glenn GREENWALD
Éditeur
The Intercept
Date

Em vídeo, Lula diz que não tem medo do que está por vir. Au Brésil, les opposants à l'oligarchie libérale sont envoyés en prison ou tués. Un coup d'état pur et simple. Via Éric Battistelli (photo de Francisco Proner).

Titre
Brésil Noir
Auteurs
  • Éric BATTISTELLI
Éditeur
Medium
Date

Lula

Lula, 1980-2018.

Vandaliser Wikipédia pour faire sa pub

Yesterday, we were disappointed to learn that The North Face, an outdoor recreation product company, and Leo Burnett Tailor Made, an ad agency retained by The North Face, unethically manipulated Wikipedia. They have risked your trust in our mission for a short-lived marketing stunt.

Titre
Let's talk about The North Face defacing Wikipedia
Éditeur
Wikimedia Foundation
Date

En fait, c'est ce que fait la pub partout dans les villes via les affiches dans le métro ou dans les rues : s'imposer dans l'espace public.

Les routes de l'asie

Bannière

The adaptability of our species, as revealed by the geographic routes and palaeoenvironmental contexts of human dispersal beyond Africa, is a prominent topic in archaeology and palaeoanthropology. Northern and Central Asia have largely been neglected as it has been assumed that the deserts and mountain ranges of these regions acted as ‘barriers’, forcing human populations to arc north into temperate and arctic Siberia. Here, we test this proposition by constructing Least Cost Path models of human dispersal under glacial and interstadial conditions between prominent archaeological sites in Central and East Asia. Incorporating information from palaeoclimatic, palaeolake, and archaeological data, we demonstrate that regions such as the Gobi Desert and the Altai Mountain chains could have periodically acted as corridors and routes for human dispersals and framing biological interactions between hominin populations. Review of the archaeological datasets in these regions indicates the necessity of wide-scale archaeological survey and excavations in many poorly documented parts of Eurasia. We argue that such work is likely to highlight the ‘northern routes’ of human dispersal as variable, yet crucial, foci for understanding the extreme adaptive plasticity characteristic of the emergence of //Homo sapiens// as a global species, as well as the cultural and biological hybridization of the diverse hominin species present in Asia during the Late Pleistocene.

Titre
Heading north- Late Pleistocene environments and human dispersals in central and eastern Asia
Auteurs
  • Feng LI
  • Nils VANWEZER
  • Nicole BOIVIN
  • Xing GAO
  • Florian OTT
  • Michael PETRAGLIA
  • Patrick ROBERTS
Éditeur
Public Library of Science
Date
doi
doi:10.1371/journal.pone.0216433

Observation d'hydride d'hélium

During the dawn of chemistry, when the temperature of the young Universe had fallen below some 4,000 kelvin, the ions of the light elements produced in Big Bang nucleosynthesis recombined in reverse order of their ionization potential. With their higher ionization potentials, the helium ions He2+ and He+ were the first to combine with free electrons, forming the first neutral atoms; the recombination of hydrogen followed. In this metal-free and low-density environment, neutral helium atoms formed the Universe’s first molecular bond in the helium hydride ion HeH+ through radiative association with protons. As recombination progressed, the destruction of HeH+ created a path to the formation of molecular hydrogen. Despite its unquestioned importance in the evolution of the early Universe, the HeH+ ion has so far eluded unequivocal detection in interstellar space. In the laboratory the ion was discovered as long ago as 1925, but only in the late 1970s was the possibility that HeH+ might exist in local astrophysical plasmas discussed. In particular, the conditions in planetary nebulae were shown to be suitable for producing potentially detectable column densities of HeH+. Here we report observations, based on advances in terahertz spectroscopy and a high-altitude observatory, of the rotational ground-state transition of HeH+ at a wavelength of 149.1 micrometres in the planetary nebula NGC 7027. This confirmation of the existence of HeH+ in nearby interstellar space constrains our understanding of the chemical networks that control the formation of this molecular ion, in particular the rates of radiative association and dissociative recombination.

Titre
Astrophysical detection of the helium hydride ion HeH +
Auteurs
  • Rolf GÜSTEN
Éditeur
Nature Publishing Group
Date