Monthly Archives: July 2020

Coronavirus updates: new virus strain may spread faster

Chicago, Pennsylvania now has quarantines for travelers from more than a dozen states. Texas Governor Greg Abbott issued a face-covering mandate statewide. Several Secret Service agents tested positive before Vice President Pence’s trip to Arizona. There is a new strain of the coronavirus that causes COVID-19, and health experts say …

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How to get rid of the coffee stain effect

Credit: University of Twente. The coffee stain effect is a well-known effect in physics and daily life in which a dark colored edge remains when a liquid containing particles evaporates. This is caused by an “avalanche” of particles moving toward the outer edge, scientists at the University of Twente showed …

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