There is little doubting the dedication of Sam Altman to Openai, the firm at the forefront of an artificial-intelligence (ai) revolution. As co-founder and boss he appeared to work as tirelessly for its success as at a previous startup where his singlemindedness led to a bout of scurvy, a disease more commonly associated with mariners of a bygone era who remained too long at sea without access to fresh food.  So his sudden sacking on November 17th was a shock. The reasons why the firm’s board lost confidence in Mr Altman are unclear. Rumours point to disquiet about his side-projects, and fears that he was
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