Today in architecture we learned that the dome of the Capitol building is made of iron, and that it takes 43,000 pounds of paint each time it is repainted. For fun, we guesstimated how many gallons of paint that would be. Surely paint weighs more than water, but since I know water weighs 8lbs per gallon, we used that number and figured it takes 1,075 five gallon buckets of paint to paint the dome.
Marvelous Pigs in Satin 
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