Other Types of Vampires
In The Gunslinger, Roland Deschain mentions literal vampire bats whose bite turns victims into vampires.
In The Dark Tower, the existence of "psychic vampires" is revealed, who feed on emotions as opposed to blood, can change shape, and can mask their surroundings via a glammer.
Read more about this topic: Vampire (Stephen King)
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“Science is intimately integrated with the whole social structure and cultural tradition. They mutually support one other—only in certain types of society can science flourish, and conversely without a continuous and healthy development and application of science such a society cannot function properly.”
—Talcott Parsons (1902–1979)