Elon Musk's own AI system is not convinced by his claim that his five-year-old son gave him a black eye. The billionaire, 53, showed up to his Oval Office farewell on Friday with a noticeable bruise under his right eye, claiming his five-year-old son, X, caused it. 'We were horsing around and I told him to punch me in the face,' Musk said. 'Turns out a five-year-old can punch, actually. I didn't really feel much at the time.'

A father who created a moving video game which re-enacts the last years of his five-year-old son's life before he died of a terminal brain cancer has launched the game on the iPhone. Ryan Green, 34, of Loveland, Colorado designed That Dragon, Cancer which gives players the opportunity to'relive memories, share heartache and discover the overwhelming hope that can be found in the face of death'. The game was a huge hit on the PC and Mac when it launched earlier this year and now users can play it on their iPhone for 4.99. Joel was diagnosed with an Atypical Teratoid Rhabdoid Tumor (AT/RT) at age one, but surprised doctors by outliving his bleak prognosis by more than three years. In the years following his diagnosis there was a brain surgery, six weeks of radiation, intense chemotherapy, several tumor recurrences and a relocation to San Francisco to pursue a medical trial, which wasn't able to help Joel.