Inside a former horse stable in the San Francisco neighbourhood of SoMa, a wave of gentle chirps emerged from small, blinking devices pinned to the chests of employees at a startup called Humane.It was just weeks before the startup's gadget, the Ai Pin, would be revealed to the world - a culmination of five years, $240 million in funding, 25 patents, a steady drumbeat of hype and partnerships with a list of top tech companies, including OpenAI, Microsoft and Salesforce.Their mission? No less than liberating the world from...