To solve a long-standing puzzle about how long a neutron can 'live' outside an atomic nucleus, physicists entertained a wild but testable theory positing the existence of a right-handed version of our left-handed universe. They designed a mind-bending experiment to try to detect a particle that has been speculated but not spotted. If found, the theorized 'mirror neutron' -- a dark-matter twin to the neutron -- could explain a discrepancy between answers from two types of neutron lifetime experiments and provide the first observation of dark matter.
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