Artificial Intelligence is the intelligence exhibited by machines or software. One day AI will be able to improve itself and exceed human intelligence and possibly pose a doomsday threat.
AI will most likely exceed human intelligence since they are machines and aren't limited by biology such as humans. Luke Muehlhauser argues, "Eventually the AI becomes sophisticated enough to start improving itself—not just small improvements but improvements large enough to cascade into other improvements ... and the AI leaves our human abilities far behind." Our axons carry signals at 75 meters per second or slower. A machine can pass signals along about 4 million times more quickly. The brain's size and neuron count are constrained by skull size, metabolism, and other factors. AIs could be built on the scale of buildings or cities or larger. When we can make circuits no smaller, we can just add more of them.
AI also pose a doomsday threat if they manage to advance before the human race. Kaj Sotala states, "A true AI would have immense economic potential, and when money is at stake, safety issues get put aside until real problems develop—at which time, of course, it may already be too late." An AI built from scratch would have no reason to care about its creators, unless it was expressly designed to do so. And even if it was, a designer building the AI to care about her must very closely consider what she actually means by "caring" for these things are not givens, even if we think of them as self-contained concepts obvious to any intelligent mind.
The human race should keep in mind when they are creating AI that they are not human, they are machines that can be better than the entire human race and are unpredictable if not created properly.