techniques and devices used to detect nuclear weapons are being deployed in the search for dark matter – the mysterious material that makes up perhaps 25% of the universe but which we know almost nothing about. located in an abandoned mine nearly a mile underground beneath the Black Hills of South Dakota, the LUX experiment is shielded from cosmic rays by the rock, and immersed in a tank of ultra-pure de-ionized water to keep out stray radiation. beyond observing dark matter particle interactions, which have so far eluded direct detection, the experiment could lead to smaller, more capable devices to search for rogue nuclear material