Nosferatu creeps up the stairs at the exhibition “Vampires: Art, History, Myths And Realities.” Francisco Morales/DAMMPHOTO/Eyepix Group/Future Publishing via Getty Images Lore about vampires and other blood-drinking beings has existed for centuries. For hundreds of years, people have been coming up with scientific explanations. Some link diseases to vampire-like characteristics like pale skin and light sensitivity. In the early 1700s, a series of unusual events…