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Show Ball Lightning The rarest and least understood form of lightning is ball lightning, a slow-moving globe of fire which varies in diameter between 2 and 20 inches, says Collier's. It is usually usu-ally discovered traveling horizontally horizon-tally a few feet from the ground. One of the most remarkable of these fire balls, which appeared in Milan, Italy, not long ago, floated so slowly down the middle of a street that a crowd of boys were able to walk beside it for half a mile before it struck an obstacle and exploded harmlessly. |