Mark Zuckerberg, Paypal founder Elon Musk and Ashton Kutcher have invested $40 million in an artificial-intelligence start-up, Vicarious, which can already ‘read’ CAPTCHA codes – and aims to mimic functions of the human brain. Mark Zuckerberg, Paypal founder Elon Musk and Ashton Kutcher have invested $40 million in an artificial-intelligence start-up, Vicarious, which has already sent ripples thro