Students place ordinary, unmodified alarm clocks in their school as end of year prank; charged with felony "planting false bombs" after state troopers and custodian flip out.
Wal-mart's data center, constructed almost like a military bunker, houses at least 460 terabytes of storage and has computers valued at $31.7 million.
Wal-mart is analyzing its customers' spending and movement throughout their stores.