Lateral flow tests have become a common feature in our lives. What impact can they have on managing COVID-19?
When you receive a positive test result for a disease, the chance you actually have it depends on how common the disease is.
Why a positive test result doesn't necessarily mean you have the disease.
London 2012 vowed to be the cleanest Olympics ever, with more than 6,000 tests on athletes for performance enhancing drugs. But when an athlete does fail a drug test can we really conclude that they are cheating? John Haigh does the maths.