Truemors
The fourth detector - called Alice (how nice of them to give it a name) - will hunt for an extremely dense and exotic state of matter which is thought to have existed a fraction of a second after the big bang. For this, the LHC will collide heavy ions such as lead, rather than lighter protons.
Alice (pictured above) will also try to spot exotic new particles and validate theories that aim to unite three of the four fundamental forces of nature.
Photo credit: Cern from http://hardware.silicon.com/servers/0,39024647,39167217-6,00.htm
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