A reliable indicator of the air quality in offices, classrooms, or living rooms is the CO2 content. In fresh air, the concentration of carbon dioxide is around 400 ppm. This stands for “parts per ...

The new container ship, OOCL Piraeus, docks at the Port of Piraeus in Greece in 2023. Xinhua via Getty Images This interactive map tracks China’s growing maritime influence through investments in ...

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Before it became fodder for right-wing YouTubers, local journalists had been investigating welfare fraud in Minnesota’s Somali community.