According to Gallivan's second equation, a sheet of 16gsm(.081mm thick) paper just on 65m square is needed to be...

According to Gallivan's second equation, a sheet of 16gsm(.081mm thick) paper just on 65m square is needed to be able to fold it in alternating directions 12 times, resulting in a wad 32cm thick.

Now, where to find 16gsm paper...
http://en.wikipedia.org/wiki/Britney_Gallivan

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