Escaping artificial light even for a winter weekend can reset sleep patterns for the better, researchers say. One good place to do it: Heliotrope Ridge near Mount Baker in Washington state.
Christopher Kimmel/Aurora Open/Getty Images
Sir David Attenborough at the Beijing Museum of Natural History with fossil of Juramaia, as featured in the Smithsonian Channel series Rise of Animals: Triumph of the Vertebrates.
Courtesy Smithsonian Channel
All of our scientific tools have limits. These limits ensure that we will never see the whole picture. We can never have complete knowledge of the universe. Above, the ESO's APEX radio telescope probes the heavens from its lonely perch on Chile's Chajnantor plateau.