They flit across the sky — small, hushed, seemingly innocuous. And they are changing the world.
As the United States expands surveillance of its 1,900-mile border with Mexico, operating the monitoring technologies involved becomes more challenging.
Stunningly precise 3-D images of the Sonoran Desert’s mountains, bluffs and boulder-filled arroyos floated across the computer screen. But one image made Joe Cook suddenly sit up straight.