The Department of Physics at ENS Paris invites applications for two JRC (Junior Research Chairs) at postdoctoral level. Appointments will be for two years with a probable one-year extension. The Department aims at recruiting outstanding candidates with international experience. Research activities can be experimental and/or theoretical ; this year, the department aims at hiring a Junior Research Chair in Theoretical Biophysics (research topic : biological physics : from decision theory to navigation). The other position is open either for theoreticians or experimentalists. Experimental projects are encouraged through a reserved budget.