In the Oct. 14 SN: 2017’s scientists to watch, duel over a real-life Brienne of Tarth, the origin of ultrahigh energy cosmic rays, long-lasting spheres of color, watermelon snow’s downside, support for the Unruh effect, polite robots and more.
HITCHHIKERS These marine sea slugs stowed away on a derelict vessel from Iwate Prefecture in Japan before being washed ashore in Oregon in April 2015.
John W. Chapman
DANGER DETECTOR In planarians (Schmidtea mediterranea shown), a protein called TRPA1 detects hydrogen peroxide, a molecule produced when cells are damaged. These new results give hints about the evolution of human pain.
Chris Petersen/Northwestern University
STICKY SITUATION At the La Brea Tar Pits in today’s Los Angeles, mastodons, dire wolves, saber-toothed cats and thousands of other creatures — prey and predators — were trapped and later excavated.