Octopus skin can detect light and respond to it — no eyes or brain required. Tests of fresh skin samples from California two-spot octopuses (Octopus bimaculoides) show this ability clearly for the first time in any cephalopod, says Todd Oakley of the University of California, Santa Barbara. White or blue light prompts the pale skin’s tiny quick-change color organs, or chromatophores, to expand, creating waves of yellows and browns.
Organic matter has been found on Mars in soil samples taken from 3 billion-year-old mudstone in the Gale crater by the Curiosity rover, NASA announced Thursday. The rover has also detected methane in the Martian atmosphere.