Examining mistakes gives students a chance to discuss misconceptions openly and find new approaches to solving problems.

Sometimes, an appellate court uses oral argument to help it decide who ought to win. Other times, the justices know who will win, and oral argument becomes an opportunity for the judges to use counsel ...

This paper first exposes some of the defects in the interval arithmetic algorithms of Moore and Krückeberg. Then it identifies classes of problems on which these algorithms compute "optimum bounds".