Microsoft's disastrous Tay experiment shows the hidden dangers of AI

Humans have a long and storied history of freaking out over the possible effects of our technologies. Long ago, Plato worried that writing would hurt people's memories and "implant forgetfulness in their souls." More recently, Mary Shelley's tale of Frankenstein's monster warned us against playing God. Today, as artificial intelligences multiply, our ethical dilemmas have grown thornier. That's because AI can (and often should) behave in ways human creators might not expect.