Correction: The story about the world’s most powerful magnet with a
13.5-tesla field (In Brief, 10 May, p 16),
should have made it clear that this was for a dipole magnet as opposed to
a solenoid magnet. It is more difficult to generate a strong field in a dipole
magnet because the high magnetic field is oriented so that it actually tries
to rip the magnet apart.
