What rises and falls but never moves from its spot?

What can silence an entire room with a single click, without uttering a sound itself? Solve the riddle → Many await me eagerly, but few cheer when my contents are revealed. I receive everything from good news to adult responsibilities, often in paper form. Solve the riddle → Without moving, I can make minutes feel like hours, while you wait for your turn. Solve the riddle → It divides the world's map into invisible segments, and throws your internal clock out of sync when you cross it. Solve the riddle → What is it that must be broken to work? Solve the riddle →