An interesting study of the twin paradox in a universe with periodic boundary conditions.
Norton talks about general covariance, and the historical treatment of manifolds.
Kostro gives an account of Einstein’s notion of ether.
Goenner describes the reception of relativity in Germany, on the basis of books published between 1908 and 1945.
Barbour discusses Einstein’s examination of Mach’s problem.
Westmoreland presents a new version of an old thought experiment, and its relation to experiments in special relativity, with frequent interruptions from his supervisor and audience.