Unusual Characteristics
In the 1970s Etna erupted smoke rings, one of the first captured events of this type, which are extremely rare. This happened again in 2000.
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Famous quotes containing the word unusual:
“In proceeding to the dining-room, the gentleman gives one arm to the lady he escorts—it is unusual to offer both.”
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)