We look at the science behind cutting covid isolation to 5 days

Vets declare the largest ever outbreak of bird flu across Europe, but why now and how should we respond… We’re looking into the microscopic world of nanotechnology: the science of the very small, including the incredible story of the sword of Damascus; it turns out that the blacksmiths of centuries ago knew a thing or two about carbon nanotubes and how to make metal incredibly tough.