Has anyone noticed the new *update* onCause i have

What type of literary device is demonstrated in this passage from the monkeys paw father and son

How dose religion today compared to the puritans idea of religion

[he] let his gaze wander to the swirling water of the stream racing madly beneath his feet. a piece of dancing driftwood caught his attention and his eyes followed it down the current. how slowly it appeared to move! what a sluggish stream! what contrasting words are used to describe the stream in this passage?