1) The world's first credit card was introduced in 1950 by Diners Club.
2) The word "triangle" contains four vowels: I, A, E, and E.
3) The assassination of Archduke Franz Ferdinand of Austria in 1914 triggered the start of World War I.
4) The world's largest flower is the Rafflesia arnoldii, which can grow up to 3 feet (1 meter) in diameter and weighs about 15 pounds (7 kilograms).
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