The world's largest building without
internal supports is the Goodyear Airship hangar,
in Akron, Ohio - it has 55 million cubic feet of air.
Clouds form in the top of the structure during sudden temperature
changes, and it rains
About 25% of the universe consists of "dark matter",
and about 70% consists of "dark energy",
leaving only about 5% of the universe visible to us.
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