SN Online SN Online Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Science News October 19, 2012 at 11:24 am ON THE SCENE BLOG Deep brain stimulation shows promise for treating spinal cord injuries. Read “Brain zap helps spine-damaged rats walk.” X-ray: NASA, CXC, G. Cassam-Chenaï and J. Hughes et al/Rutgers Univ., Radio: NRAO, AUI, NSF, GBT, K. Dyer, R. Maddalena and T. Cornwell/VLA, Optical: F. Winkler/Middlebury College, NOAO, AURA, NSF, CTIO, Schmidt/DSS ATOM & COSMOS Two white dwarf stars may have triggered a supernova that left bubble-shaped remains. See “No companion in supernova debris.” HUMANS A small-scale society figures out how to put an end to years of violence. Read “In New Guinea, peace comes with a price.” ENVIRONMENT Poor ventilation in classrooms may affect student cognition. Learn more in “Elevated carbon dioxide may impair reasoning.”