As future covid-19 prevalence varies across time, health authorities must revolutionise testing to see if people are infected.

Viruses do not evolve with the purpose of being more or less infectious or dangerous: it is just natural selection at work. New random variants occur continuously and most of them are neutral or make the virus less infectious.

Darwin would be puzzled. He described natural selection as a slow process, selecting for the most suited organisms to a given environment.

Between 30 and 40 million people in Europe suffer from rare diseases —many of them children. As most of these diseases have genetic origins, gene therapy is a major hope for their future cure .

We age in two ways. There is the ageing we count by clock and calendar. And then there is biological ageing. The latter is written into our genes. But, it is also influenced by our lifestyle and history.

Peanut, egg and soy are more common food known to trigger an allergic reaction, a problem affecting around 8% of children in the EU. Intuitively, you might not list apples as causing allergic reactions.