You could buy
You can buy one of the following:
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Year of Wikipedia
Yearly expenditure of Wikimedia Foundation, 2007/8 for US$3,541 thousand (﷼ 13,280 thousand) from wikipedia -
A grain of sand made of anti-hydrogen gas
A grain of sand made of anti-hydrogen gas for US$3,408 thousand (﷼ 12,780 thousand)
Buy each rat in New York city
You can buy each rat one of the following items:
Shopping list
You can buy all of the following:
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1 Enough gold leaf to cover an American football field
Cover an American football field with a single layer of gold leaf for US$2,879 thousand (﷼ 10,800 thousand) from amazon -
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2 thousand Carl Sagan's Cosmos DVDs
Inspirational and wide-appeal science series. Thirteen episodes, each one hour long. for £11.71 (﷼ 67.37) from source