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.
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.
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