And then a few decades, computers will be thousands of times more powerful than they are today. Already, computers use artificial intelligence to easily beat the world's greatest chess masters, recognize faces, understand spoken language and even compose music. They can do many of the things that we've always thought made us human and that threatens many of the jobs, we've always felt more secure take driving a vehicle, which is one of the top jobs in most states in America. With driverless cars already on public roads, millions of truck drivers, bus drivers and taxi drivers may soon find themselves obsolete. In hospitals, hundreds of thousands of jobs are on the line as computers learn to analyse CAT scans and biopsies, deliver low-level anesthesia and even do surgical procedures. And in restaurants, hundreds of thousands of cooks may be replaced in the coming decades by machines that can follow recipes perfectly without ever taking a sick day or a smoke break. An Oxford University study predicts that within 20 years, forty-seven percent of all jobs are at risk of being replaced by technology, that's over 70 million people.