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  • Pyroforic substances have an autoignition temperature below room temperature and often require mere contact with air or water in order to spontaneously ignite. A characteristic of pyrophoric materials is also their large specific surface of contact with air. — “Spontaneous combustion - Wikipedia, the free encyclopedia”,
  • In many of the more recent cases, where photographic evidence is available, it is alleged that there was an external source of heat present (often cigarettes), and nothing occurred "spontaneously. "Fiery tales that spontaneously destruct - reports on spontaneous human combustion. — “Spontaneous human combustion - Wikipedia, the free encyclopedia”,
  • Empedocles accepted the spontaneous generation of life, but held that there had to be trials of combinations of parts of animals that spontaneously arose. Successful combinations formed the species we now see, unsuccessful forms failed to reproduce.[3]. — “Spontaneous generation - Wikipedia, the free encyclopedia”,


  • The heathen poets had learned, most probably from tradition, that our first parents lived for some time in peaceful innocence; that, without tillage, the garden of Eden furnished them with fruit and food in abundance; and that the animals were submissive to their commands: that after the fall the ground became unfruitful, and yielded nothing without labor; and that nature no longer spontaneously acknowledged man for its master. — “Metamorphoses” by Ovid
  • And it came so suddenly and spontaneously from the groundlings and the body of those in the amphitheatre that he was almost scared by it–as a boy may be scared who has held a match to a sun-scorched hayrick. — “Sacaramouche” by Rafael Sabatini
  • His words and actions flowed from him as evenly, inevitably, and spontaneously as fragrance exhales from a flower. — “War and Peace” by Leo Tolstoy
  • It is remarkable that throughout their whole acquaintance Grushenka was absolutely and spontaneously open with the old man, and he seems to have been the only person in the world with whom she was so. — “The Brothers Karamazov” by Fyodor Dostoevsky
  • The slightest obstacle would have repelled me; but my eye glanced almost spontaneously upon the paper. — “Wieland” by Charles Brockden Brown
  • The minister–for, save the long-sought regards of woman, nothing is sweeter than these marks of childish preference, accorded spontaneously by a spiritual instinct, and therefore seeming to imply in us something truly worthy to be loved–the minister looked round, laid his hand on the child's head, hesitated an instant, and then kissed her brow. — “The Scarlet Letter” by Nathaniel Hawthorne


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