COVID-19 RNA test positive after infection contagiousness

A positive COVID-19 test does not prove contagiousness

COVID-19 nucleic acid tests look for the virus’s RNA, not whether it can still infect someone. A positive result may come from harmless viral material being cleared after an infection, so it does not by itself show that a person remains contagious.

Sweden had the world's highest carbon prices in 2020

Sweden was the first country to introduce carbon pricing. The approach is described as particularly effective at reducing carbon emissions from the economy.

Octopuses can walk while pretending to drift

Some octopuses move using only two arms while making themselves look like pieces of drifting plants. This lets them move away from predators while staying hidden instead of simply swimming away.

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COVID-19 RNA test positive after infection contagiousness

A positive COVID-19 test does not prove contagiousness

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