your s first mission to mercury. and it s back. the london marathon returns to the city streets on sunday for the first full scale race in more than two years. hello, and welcome to the programme. they could be a breakthrough in the way we treat covid 19. interim trials treat covid i9. interim trials suggest a new experimental drug for severe covid cuts the risk of hospitalisation or death by about half. if authorised by regulators, the new drug, which comes in the form of a pill, would be the first antiviral medication for covid i9. mike lobel reports. this is the first covid pill. trial results suggest it can cut hospitalisations or deaths by half.