A terrifying interactive map reveals just how much of major UK cities would be flattened by the impact of the 'city killer' ...

NASA warns that the odds of the 'city-destroying' asteroid 2024 YR4 hitting Earth have increased to a one in 43 chance.

It was the fourth pig kidney transplant in the United States, and the first of three that will be done at Mass General as part of a new clinical trial sanctioned by the Food and Drug Administration.