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ballast
Ballast may mean:
Trivia about ballast
(Jimmy of the Clue Crew reports from the Vasa Museum in Stockholm, Sweden.) The Vasa capsized on its 1628 maiden voyage because tons of stones, used as this, didn't counterweigh the guns, masts, sails, & upper hull
Heavy material placed in a ship's hold
It's any heavy material placed in the gondola of a balloon or the hold of a ship to enhance stability