Walmart wants to monitor shoppers' facial expressions

The store found some help in its war against Amazon. Walmart is coming off an 11-day rally, it's longest since 1995. In the future, Walmart shoppers may not have to ask for help. Just a simple scowl could summon a helpful worker ready to assist. A recent patent filing suggests new ways the nation's top retailer wants to get even closer to its customers: a video system that a system keeps tabs on customers' facial expressions as they move through the store and the movements at checkout lines.