The Fermilab accelerator complex accelerates protons and antiprotons close to the speed of light. The Tevatron, four miles in circumference, is the world’s most powerful accelerator, producing collisions at the energy of 2 tera electron volts (TeV). In a tiny volume, these collisions recreate the conditions of the early universe. Two experiments, CDF and DZero, record the particles emerging from billions of collisions per second.