Chicago Tribune Columnist Eric Zorn signs ‘Shamu’

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FILE – In this Nov. 30, 2006, file photo Kasatka the killer whale performs during SeaWorld’s Shamu show in San Diego. SeaWorld will end its orca shows at its San Diego park by 2017, its top executive said Monday, Nov. 9, 2015, saying customers at the location have made clear they prefer killer whales acting more naturally rather than doing tricks. (AP Photo/Chris Park, File)

Chicago Tribune Columnist Eric Zorn joins John Williams to talk about why your signature on a credit card receipt actually doesn’t matter a hoot.

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