Researchers measured brain activity of 47 healthy adults -- a small but scientifically valid size group for this type of study -- while using a mobile device.

CNN: Cell phone exposure increases brain cell activity

"It's a false premise, " says retail expert Britt Beemer of America's Research Group on the notion of Wal-Mart's same-store sales as a valid economic measurement.

FORBES: Wizardry At Wal-Mart