In June 2010, I traveled to Lead, South Dakota to visit the site of the future Sanford Underground Research Lab (formerly the Deep Underground Science and Engineering Lab).  The lab was under construction–in fact, it’s still under construction today–but a group of physicists were already hard at work constructing the site’s first experiment: the Large Underground Xenon detector. Someday, the team hopes this detector will find dark matter, one of the biggest modern cosmological mysteries.  To read more about the project, check out the feature that I wrote for Popular Science.