Viral, a gripping new book by Alina Chan and Matt Ridley, probes at the heart of the investigation into the origins of Covid-19 and the qu… Viral, a gripping new book by Alina Chan and Matt Ridley, probes at the heart of the investigation into the origins of Covid-19 and the question preoccupying scientists around the world. Was this a natural disaster, as we first believed, a naturally occurring virus that jumped from animals to humans…or the laboratory leak of a possibly engineered coronavirus — and a cover-up of epic proportions? Here, in an exclusive essay for the Mail, MATT…