"When you get to the top of the wall there is a straight drop, a small flat bit and a slope bringing the ground back to the same level, " he said.

BBC: Hopetoun House: Man sues over bat walk 'ha-ha' fall

The difference is that in retailing, they're using a very simple, physically flat bit of circuitry that's put into clothes and other items, and which is then energized and detected by a transmitter.

NPR: The Marketplace Report: U.K.'s Car Tracking System

You know, even the amount of money that's spent on the Climate Change Research Program, which is spread across several agencies, is down a bit this year, basically flat, but down a bit.

NPR: Budget Breakdown: Defense, Health and Energy