OpenAI employees threaten resignation over Altman sacking

Following the firing of CEO Sam Altman, almost all of OpenAI's 770 staff have signed a letter threatening to resign unless he is reinstated.Microsoft's stock reached a record high after it said Mr Altman would be joining the company to head its artificial intelligence innovation leg.Sam Fenwick hears what it means for the future of OpenAI and what the ripple effects will be for the wider industry.