Another would be to slow a pulsar's spin down in pretty short order.
ECONOMIST: Pulsars
2.
X-ray millisecond pulsar has proved puzzlingly slow and drawn-out.
ECONOMIST: The dizziest, giddiest stars
3.
But the slow decay in radiation intensity from a tabletop pulsar would make possible extremely long-range transmitters, giving far-off space probes an energy-efficient way to beam information back to earth.