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.
NFL Commissioner Roger Goodell at a press conference in May. Goodell's handling of concerns about concussions and controversies surrounding players has led commentator Frank Deford to wonder whether Goodell is up to the job.
Jeff Koons poses in front of one of his sculptures during a media preview of "Jeff Koons: A Retrospective" at the Whitney Museum of American Art on June 24, 2014.
Timothy A. Clary/AFP/Getty Images
Twelve-year-old Hayley Lindsay spent almost a month working with her dad on this Toothless the Dragon costume. There are sawn-off crutches in the front legs so she can comfortably walk on all fours.