Write a program with a loop that asks the user to enter a series of positive numbers. the user should enter a negative number to signal the end of the series. after all the positive numbers have been entered, the program should display their sum.

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Write lines of verse that rhyme to remember the following information: acid rain is a type of air pollution caused by chemicals in the air.

Why were most movies from the late 1890s until the early 1930s only filmed in black and white? there were only a few people who could afford the technology to produce color motion pictures back then. audiences did not want color motion pictures until later. the film used to make color motion pictures often overheated, which was a safety hazard, so it was generally not allowed. color films had to be hand-colored, frame by frame.