From mythology to machine learning, a history of artificial intelligence

From helping in the global fight against Covid-19 to driving cars and writing classical symphonies, artificial intelligence is rapidly reshaping the world we live in. But not everyone is comfortable with this new reality. The billionaire tech entrepreneur Elon Musk has referred to AI as the "biggest existential threat" of our time. With recent scientific studies testing the technology's ability to evolve on its own, every step in its development throws up new concerns as to who is in control and how it will affect the lives of ordinary people. Here are 9 important milestones in the history of AI and the ethical concerns that have long loomed over the field.