A magnetic field holds a tiny particle in mid-air, like an invisible dance partner. A special tuning of the field creates a trap with two "positions." In the ordinary world, a dancer occupies only one, but in the quantum world — both at once. Physicists have learned to achieve this for dust grains weighing trillionths of a gram.
To create the trap, you only need fixed coils with adjustable current. Experiments with levitating particles will test theories at the boundary of quantum physics and gravity, refine the Standard Model and link it with spacetime curvature. They'll also help in the hunt for elusive dark matter.
Quantum dances are usually performed by atoms, but here dust grains that are thousands of times heavier than atoms whirl in the trap.