The device evolved from a rubbing tool used for rubbing dyes dating around 6000 to 7000 years ago.

Such devices, though designed for personal use, have evolved into "corporate productivity tools" as well, Mr. Revis said.

Two years ago he turned his attention to games for cellphones, convinced that the devices were evolving into entertainment units.

In an interview, Mr. Johnson said the device was fast evolving into a high-efficiency engine.

We believe we are looking at the first Ixian Globe, the noroom from which all such devices evolved.

These devices evolved to metal blocks.

These characters often help Munro enter areas or disable devices crucial for plot to evolve.

The device, originally made of wood, evolved into an aluminum trough, 30 inches long, on which a golf ball is placed.

I was very cynical about tablets & smartphones at first, but, as these devices evolve I'm pretty rapidly changing my mind.

As new technology has become available, these devices have evolved from simple still black and white images to the sophisticated full colour short films seen today.