Upsidaisium
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Upsidaisium is a fictional element that appeared in the 1950s and 1960s Rocky and His Friends and The Bullwinkle Show animated series, in the storyline entitled "Upsidaisium."
As revealed in the storyline, upsidaisium was a rare mineral that possessed antigravity properties; as a result, it was usually shown as hovering above the ground to varying degrees, and required heavy weights to keep it rooted to the ground for storage. The source of upsidaisium came from Mount Flatten, a mountain located in the American southwest that floated high above the ground (the mountain contained large deposits of upsidaisium).
In the storyline, Bullwinkle had inherited the mountain from a late uncle, and set out with his friend Rocky the flying squirrel to claim the mountain and turn its upsidaisium over to the United States government, though their efforts meet hindrance from the series' villains, Boris Badenov and Natasha Fatale.
A followup storyline, "Metal Munching Mice", showed that upsidaisium in small amounts was capable of escaping Earth's gravitational pull and drifting off into outer space, if left unchecked or uncontrolled.
