We explore why you need to be extremely careful when combining the reproduction ratios of a disease in different settings, such as hospitals and the community.
How do mathematical models of COVID-19 work and should we believe them? We talk to an epidemiologist, who has been working flat out to inform the government, to find out more.
To celebrate the recent centenary of the first major test of Einstein's general theory of relativity, we look back over how our picture of gravity has changed.