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Fix for OpenCart Error: The security header is not valid

Posted on Feb 23, 2015 | Last Updated Feb 24, 2015

A solution for the error 'The security header is not valid' in OpenCart when using PayPal Express Checkout.

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opencart, paypal express checkout

Feasts of Creativity

Posted on Jan 6, 2005 | Last Updated Nov 8, 2011

Graphic of a crystal photo manipulated to look like a dragon.

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creative feast, crystal dragon

Using the Internet

Posted on Oct 19, 2002 | Last Updated Oct 26, 2011

This editorial on education was printed as a Chalkboard column in the Messenger.

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how people can use the internet, internet value

Inversion

Posted on Jul 14, 2005 | Last Updated Nov 8, 2011
infinitesimal inversionseeds of inversiontransitional inversion

Computer art called Inversion composed in Corel PhotoPaint using photos of dandelions.

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inversion, computer art, corel photopaint, photo-paint
Angry Teapot Level Design Awards