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Large Hadron COLLIDER
This thing looks amazing. Its probably the most complicated thing humanity has ever built, has taken 20 years to finish, is 27 km in circumference, spans over 2 countries and could possibly blow up the world or revolutionise the world of physics.
WOW!
http://www.darkroastedblend.com/2008/03/time-machine-worlds-biggest-particle.html