Which information makes this article reliable?
fluoride has been added to drinking water since the
1960s
some people doubt the necessity of fluoridation.
more than 50 studies were conducted.
fluoride has been found to prevent cavities in teeth.

Realism was a fairly influential and widespread literary movement in the united states in the latter half of the nineteenth century. which american writer is among the pioneers of american realism? a. ernest hemingway b. f. scott fitzgerald c. j. d. salinger d. mark twain

According to the study what did john steinbeck do to prepare for his book the grapes of wrath

Select the correct text in the passage. in richard connell's short story "the most dangerous game," zaroffs aristocratic appearance and dignified manners mask his sinister, animalistic nature. which line from the excerpt best provides a glimpse into his true nature? rainsford's first impression was that the man was singularly handsome; his second was that there was an original, almost bizarre quality about the general's face. he was a tall man past middle age, for his hair was a vivid white; but his thick eyebrows and pointed military mustache were as black as the night from which rainsford had come. his eyes, too, were black and very bright. he had high cheekbones, a sharpcut nose, a spare, dark face-the face of a man used to giving orders, the face of an aristocrat. turning to the giant in uniform, the general made a sign. the giant put away his pistol, saluted, withdrew. "ivan is an incredibly strong fellow," remarked the general, "but he has the misfortune to be deaf and dumb. a simple fellow, but, i'm afraid, like all his race, a bit of a savage." "is he russian? " "he is a cossack," said the general, and his smile showed red lips and pointed teeth. "so am i." half apologetically general zaroff said, "we do our best to preserve the amenities of civilization here. forgive any lapses. we are well off the beaten track, you know." laughter shook the general. "how extraordinarily droll you are! " he said. "one does not expect nowadays to find a young man of the educated class, even in america, with such a naive, and, if i may say so, mid-victorian point of view. it's like finding a snuffbox in a limousine. ah, well, doubtless you