Sars-CoV-2, a virus of still unknown origin

Where does Sars-CoV-2 come from? The origins of the virus responsible for the Covid-19 pandemic remain unclear. After the thesis of the pangolin, that of … Read more

Positive but not contagious: the blind spot of PCR tests

Is being positive for Covid-19 necessarily synonymous with contagiousness? Or, on the contrary, does this correlation, which is more complex than it appears, necessitate refining … Read more

A spectacular new map of the world of high energies

DECRYPTION – The eRosita space telescope has just unveiled its first survey of X-ray sources from the whole sky. The entire sky seen in X-rays. … Read more