But it's just fine for Wal-Mart (also a major seller of the Center's test sample), where customers can just slide over to another section of the store to find Christmas gifts.

FORBES: Toy Scare Could Help Wal-Mart

"They're a test that relies on a human being to read a slide" and interpret what they see, Bowers says.

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Baghdatis put that slide down to "injuries and mind problems", and Murray seemed sure to test both his mental and physical capabilities as the Scot has shown already this week that he has formidable staying power.

BBC: Andy Murray beats Marcos Baghdatis at French Open