Over a half-century has passed since the concept of artificial intelligence first emerged. In the United States, a computer has been built to become a TV quiz show champion, and minor research developments such as robotic vacuum cleaners and smartphones that talk back have become commonplace. We take a look into the evolution of machine intellect.

• The goal: achieving the intelligence of a 3-year-old child
• AI entering new age where major advances being made
• Hello, kitty! Google program teaches itself to recognize cats
• Leave it to me! AIs take over daily tasks for humans
• Giving artificial intelligence some ‘common sense’