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 ...

In the world of social media, “keeping receipts” refers to the practice of storing evidence that may come in handy for a callout post at a later date. For [Teddy Warner], though, it’s more applicable ...

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As a tosser and turner, I have been sleeping on satin pillowcases since childhood. They have served as a backup for when my sleep scarf or bonnet inevitably slips off my head. For curly-haired people ...