Pàgines Web i
articles a Internet:
http://www.bbc.co.uk/bang/handson/teaser-string.shtmlhttp://mathforum.org/mathimages/index.php/Rope_around_the_Earth
http://www.abc.net.au/science/surfingscientist/pdf/conundrum17.pdf
Vídeos i audios:
http://www.youtube.com/watch?v=l2E54Xiyj1o
http://www.youtube.com/watch?v=UdDFPVriuu8
http://www.youtube.com/watch?v=8WMP-2eRjQA
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