Diseases, Conditions, Syndromes

Do Halloween masks protect you from COVID-19?

Wearing a costume and mask for Halloween has long been a holiday tradition. But a costume mask is not a substitute for a protective mask. Cloth masks combined with other preventive measures, such as frequent hand-washing ...

Diseases, Conditions, Syndromes

COVID-19: Distancing and masks are not enough

Wear a mask, keep your distance, avoid crowds—these are the common recommendations to contain the COVID-19 epidemic. However, the scientific foundations on which these recommendations are based are decades old and no longer ...

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Drop (liquid)

A drop or droplet is a small volume of liquid, bounded completely or almost completely by free surfaces. A drop may form when liquid accumulates at the lower end of a tube or other surface boundary, producing a hanging drop called a pendant drop. Drops may also be formed by the condensation of a vapor or by atomization of a larger mass of liquid.

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