A federal appeals court has revived a lawsuit accusing the University of Notre Dame of illegally using public money for religious activities connected to its training of teachers for Roman Catholic schools. In its two-to-one ruling, the panel held that the $500,000 federal grant at the center of the case could be ordered repaid if it is found to have been used improperly -- overturning the lower court judge who decided the case was moot because the money had already been spent.