Large Hadron Collider, 2009-2012
To anyone without a particle physics degree, the Large Hadron Collider (LHC) may seem like a scary piece of advanced machinery. The massive particle accelerator's circular tunnel, located just outside of Geneva, Switzerland, measures 17 miles (28 kilometers) in total circumference. It can send hydrogen protons crashing in to one another nearly of the speed of light, allowing scientists to discover new elements and particles that may shed light on the creation of the universe. That is, if everything goes as planned.
Some theorists suggest that the massive energies created during such collisions could potentially form black holes capable of engulfing the entire planet. These fears came to a head in March 2008 when Walter L. Wagner and Luis Sancho filed a lawsuit in a U.S. court to stop the LHC from beginning operation until scientists produced a safety report and environmental assessment. While most scholars acknowledge the possibility of black holes, they dismiss the danger, insisting that any such anomaly would only last a matter of seconds -- hardly long enough to swallow the earth. Despite the controversy, researchers fired up the LHC in 2009 and have accomplished some remarkable feats, including the creation of a soupy mass of matter thought to resemble the conditions of the universe just after the Big Bang. By the end of 2010, no black holes had been detected in the LHC but according to doomsayers, that doesn't mean we're in the clear. Something could always happen before scientists conclude the project in 2012.