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$3,541 thousand ($a18,720 thousand) from wikipedia -
A grain of sand made of anti-hydrogen gas
A grain of sand made of anti-hydrogen gas for US$3,408 thousand ($a18,010 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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500 Years income of average person
Yearly income of average person (worldwide) for US$7,880 ($a41,650) from source