Page 15

cnrs-ra2013

EXPERIMENTAL ARCHEOLOGY On 9 December 2013, the Gyptis set sail from Marseille (south-east France). The coastal craft, a faithful replica of the wreck of a sixth century BC Greek vessel discovered in Marseille in 1993, was entirely assembled by stitching, using the construction methods and techniques characteristic of the “sewn boats” in use at that time. This was the final outcome of a unique experimental archeology project in France, carried out in collaboration with shipwrights. 1. The LHCb magnet where the decay of Bs mesons into pairs of muons was observed. 2. The Arpin protein (in green) is located at the tips of lamellipodia, structures formed of actin networks (in red) that the cell uses to power its membrane and move. 3. The Gyptis sets off for its first sea trials in Marseille harbor. 4. Collision between two populations of self-propelled colloids with a 5-micrometer diameter, moving in opposite directions. 4 MICROFLUIDICS Shoals of fish, bacterial colonies, and vibrating particles of matter are all systems that exhibit the coordinated, collective motion of a large number of individuals even in the absence of a leader. To study this phenomenon, physicists have developed an experimental microfluidic system that enabled them to understand the spontaneous emergence of unidirectional, coherent motion in a group of several million self-propelled colloidal particles. Nature November 2013 © CNRS Photothèque / Denis Bartolo, Antoine Bricard, Nicolas Desreumaux 13 BEST OF SCIENCE


cnrs-ra2013
To see the actual publication please follow the link above