A riddle: What has the durability of a sneaker, the smarts of a computer, the color scheme of a lunchbox and the potential to alter almost everything about the way schoolchildren in the developing world learn?

The answer: well, nothing.... yet.

But now, scientists at the Massachusetts Institute of Technology say they're close to creating a device that would fulfill this ambitious vision -- a tough, kid-friendly laptop that could be sold to poor countries for $100.

A prototype of this computer will be unveiled Wednesday at a U.N. conference in Tunisia. Its designers concede that the prototype is still missing some crucial features, such as a cheap display screen and a hand crank that would provide power.

But high expectations are already standard.