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

“Track a ghost in the tundra”

Ellesmere Island, Canada. Treading the tundra, a vast white desert finally struck by the resuscitated light after the long months of polar night, a man … Read more