Walmart may scan faces to summon help

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Someday Walmart may be able to guess what you're thinking or feeling simply based on your expression.

A recent patent filing suggests that Walmart might be working on a video system that keeps tabs on shoppers' facial expressions

It would scan for customers who are frustrated, or unhappy so help from an employee can be sent their way.

Store managers could also use the system to determine if they have a popular product or not.