The Supreme Court has heard arguments about whether Donald Trump is immune from prosecution for actions he took while president. The justices have been asked to consider whether any president should have full or partial immunity. The outcome will determine, among other things, whether Trump should face trial on charges that he plotted...

A trial of the world’s first “personalised” vaccine against the deadliest form of skin cancer is under way in the UK. The mRNA vaccine is designed to help patient’s immune systems to recognise and wipe out cancerous melanoma cells. It is personalised to the individual patient – with its make-up created to match the unique genetic signature...