How can we prevent epidemics? Why do viruses and bacteria move? Rather than trying to contain epidemics one after another, why not stop the processes that encourage their emergence? The challenges are enormous, but scientists argue that solutions exist. Because if emerging diseases are the collateral consequences of our lifestyles, our lifestyles are under our control.

Au sud de l’Éthiopie, la vallée du Rift abrite l’une des plus étonnantes énigmes du continent africain. Avec leur calotte arrondie, une dizaine de milliers de stèles à forme phallique parsèment les hauts plateaux montagneux du Sidamo et du pays Gedeo, sur un territoire de 10 000 kilomètres carrés. Découverts il y a moins d’un siècle par une poignée d’explorateurs, ces gigantesques mégalithes ont été peu étudiés, à la différence des stèles anthropomorphes, dont les recherches ont révélé le caractère funéraire. Une équipe de scientifiques dirigée par Roger Joussaume, spécialiste français du mégalithisme, mène une importante campagne de fouilles sur les nombreux sites archéologiques de la région. Ils tentent de dater et de comprendre cet exceptionnel patrimoine, abandonné en l’état par une civilisation encore méconnue.

While our nights have never been shorter, an enlightening round-up of scientific discoveries around sleep disorders.

More than 2.000 years ago, Narbonne in today's Département Aude was the capital of a huge Roman province in Southern Gaul - Gallia Narbonensis. It was the second most important Roman port in the western Mediterranean and the town was one of the most important commercial hubs between the colonies and the Roman Empire, thus the town could boast a size rivaling that of the city that had established it: Rome itself. Paradoxically, the town that distinguished itself for its impressive architecture, today shows no more signs of it: neither temples, arenas, nor theaters. Far less significant Roman towns like Nîmes or Arles are full of ancient sites. Narbonne today is a tranquil town in Occitania

Faced with the relentless and unstoppable advance of the Soviet Red Army, from the spring of 1944 until the capitulation of the Third Reich in May 1945, the Nazis evacuated the labor, concentration and extermination camps, factories of pain and death which, during years of nightmare, they had established in the occupied eastern territories. Forced to travel enormous distances, thousands of people died along the way from hunger, thirst and exhaustion.

Leonardo da Vinci is not just the most famous and most admired of all painters - he is an icon, a superstar. Yet, the man himself remains elusive. Accounts during his lifetime describe a man too handsome, too strong, too perfect to be accurate. But in 2009, the chance discovery in the South of Italy of an ancient portrait with strangely familiar features takes the art world by storm. Could this be an unknown self-portrait by Leonardo da Vinci? Controversy erupts among the experts. The implications of such a discovery have far-reaching consequences for our understanding of the work of this great Renaissance master.