| 11. | The surprises include blue flame balls, apparently akin to glowing spheres of ball lightning.
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| 12. | Nearly all lightning experts agree that these objects, known as ball lightning, are real.
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| 13. | Ball lightning is one of nature's odder, and rarer, phenomena.
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| 14. | The existence of ball lightning has never been unequivocally established by film or videotape.
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| 15. | About 1 percent of the population will see ball lightning in a lifetime, he estimated.
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| 16. | The International Committee on Ball Lightning ( ICBL ) held regular symposia on the subject.
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| 17. | An international symposium of scientists investigating ball lightning will be held next year in Japan.
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| 18. | This is considered by some to be one of the earliest recorded instances of ball lightning.
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| 19. | Klass initially applied his ball lightning theory cautiously and selectively in a series of magazine articles.
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| 20. | His account, in contrast, seem to be the far more mysterious phenomenon known as ball lightning.
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