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Physics Nuclear clock ticks into action The first working nuclear clock paves the way to more accurate timekeeping – and could help us solve the mystery of dark matter, discovers Alex Wilkins SCIENTISTS have built the first working nuclear clock, which uses the vibrations of atomic nuclei to keep time. Nuclear clocks have been sought after for more than two decades, and could eventually allow for extraordinarily precise timekeeping and experiments that hunt for new physics. The most accurate atomic clocks we currently have use electrons for timekeeping. Electrons occupy distinct energy levels, or orbits, around the atomic nucleus, and they move between orbits only when they are excited with light of a very specific frequency. …