Scientists say that in as little as three years, they could solve the mystery of dark matter -- the invisible energy force that astronomers say could account for a fourth of the universe. Experts say experiments into the nature of dark matter are finally reaching sensitivity levels that are able to detect the elusive particles. "If we don't find it in this next round of experiments, I think everyone will be a bit discouraged," said Dan Bauer, a physicist at the Fermi National Accelerator Laboratory.

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