41.   Any cultural exchange is mostly one-way at the city pool.

42.   Another frustration, Britz said, was that the exchange was only weeks away from retiring the switches.

43.   Argentina says that it wants its exchange to be voluntary and that if enough bondholders agree to it, a legal default could be avoided, analysts said.

44.   Arts exchanges are only part of the business.

45.   At summits, where Jiang and Clinton have met, the exchanges have been stiff, with Jiang often reading from note cards.

46.   At times the exchanges are sharply personal and downright mean-spirited.

47.   At the top are exchanges controlled by big corporations, such as automakers, which broaden into smaller business sectors that are just beginning to form.

48.   At times the exchanges Wednesday were testy, even personal.

49.   Because they trade like stocks, investors can complete a trade, and lock in a price, whenever the exchange is open.