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Topic: unsolved problems in physics

Sensors on the Large Underground Xenon dark matter detector can register the emission of just a single photon from a dark matter interaction within the detector's giant xenon tank. So far, however, no signs of dark matter have been seen. (Matt Kapust, Sanford Underground Research Facility)

We may be close to detecting dark matter

Keith A. Spencer
(Getty/MarySan)

Honey, who shrunk the proton?

Keith A. Spencer