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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

January, 2011 Newsletter

Posted on Jan 9, 2011 | Last Updated Jul 27, 2013
Brain MazeSanta's Meal to Slay For

Newsletter from Shawn Olson on January 10, 2011.

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newsletter

Updating Custom Attributes to use AttribID

Posted on Jan 22, 2017 | Last Updated Jan 25, 2017

Discussion on using attribID in custom attributes inside 3ds Max, including pros, cons and solutions.

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custom attributes, 3ds max, maxscript, attribID, managing

The Hurry-Stop Syndrome

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

This editorial was the last Chalkboard editorial Shawn Olson wrote for the Columbus Messenger.

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impatient society, red lights

June 15, 2009 Newsletter

Posted on Jun 14, 2009 | Last Updated Nov 12, 2011
Jack Buckingham

Newsletter including the retirement of Jack Buckingham. Discussion on teachers.

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Brain Maze

Posted on Sep 10, 2010 | Last Updated Nov 12, 2011
Brain Maze

Maze of a human brain. Maybe you are an important thought or a tapeworm egg. Either way, find your way to the center of the brain.

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maze, brain

Missouri Toad

Posted on Jun 27, 2006 | Last Updated Nov 9, 2011
Toad FaceToad PhotoToad PhotoToad Photo

Photos of a toad in Missouri.

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toad, amphibian, missouri

Liquid 6teen - Billiard Club

Posted on Nov 3, 2003 | Last Updated Nov 1, 2011

Liquid 6teen played at the Billiard Club on November 1, 2003. It was drummer Shawn Huff's last show with the band.

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liquid 6teen rock band, columbus music, billiard club, shawn huff last show

Amazing Maze Challenge

Posted on Jun 4, 2003 | Last Updated Nov 19, 2011

A growing collection of mazes to challenge you.

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Angry Teapot Level Design Awards