Talks to end three-day Denver teachers strike resume after progress reported

Negotiators for striking Denver teachers and the city school district returned to the bargaining table on Wednesday after a productive session the previous day, as the walkout affecting 92,000 students entered a third day.The two sides sounded an optimistic note on Tuesday after resuming talks that had broken off on Saturday, and went late into the night seeking to resolve differences over a variable pay system, known as ProComp, which has been at the center of the dispute."We exchanged proposal