In this Oct. 29, 2013 photo, physicist Dan McKinsey of Yale University explains an experiment being conducted deep in an abandoned gold mine in Lead, S.D., to search for elusive and mysterious dark ... more 
In this Oct. 29, 2013 photo, physicist Dan McKinsey of Yale University explains an experiment being conducted deep in an abandoned gold mine in Lead, S.D., to search for elusive and mysterious dark matter. In an announcement released Wednesday, Oct. 30, 2013, scientists at the Sanford Underground Research Facility say they found absolutely no evidence of dark matter in what is the most technologically advanced Earth-based search for the material that has mass but cannot be seen. They’ll keep looking for another year, but scientists were not optimistic about finding dark matter with the current setup and are already planning to build a more sensitive experiment on the site. (AP Photo/Rapid City Journal, Kristina Barker) less 
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Associated Press | Photo By Rapid City Journal, Kristina Barker
Wed, Oct 30, 2013 3:19 PM EDT