An interesting article in National Geographic about how it's handled and what they add to it.
http://magma.nationalgeographic.com/ngm/0205/feature1/index.html
http://magma.nationalgeographic.com/ngm/0205/feature2/index.html
It makes you think twice about some things.
http://magma.nationalgeographic.com/ngm/0205/feature1/index.html
http://magma.nationalgeographic.com/ngm/0205/feature2/index.html
It makes you think twice about some things.

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