1) The total length of your blood vessels can circle the Earth more than twice.
2) The Hubble Space Telescope, launched in 1990, has provided breathtaking images of distant galaxies and deep space.
3) International relations encompass the study of relationships between nations, including diplomacy, treaties, and foreign policy. It examines the interactions and dynamics among different countries in the global arena.
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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