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39 grains is about 0.00000000002 times as heavy as The Sears Tower.
In other words, it's 0.000000000012520 times the weight of The Sears Tower, and the weight of The Sears Tower is 79,870,000,000 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 3,114,000,000,000 grains. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
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