Physics Education, Volume 40, November 1, 2005, pages 500-503.
Copyright © 2005 IOP Publishers.
The definitive version is available at http://dx.doi.org/10.1088/0031-9120/40/6/F03.
Bell’s spaceship ‘paradox’  in special relativity is a particularly good one to examine with students, because although it deals with accelerated motions, it can be dissolved with elementary space–time diagrams. Furthermore, it forces us to be very clear about the relativity of simultaneity, proper length, and the ‘reality’ of the Lorentz contraction.