These are the best and worst fabrics and filters for face masks

Q: I have accumulated several face masks during the mandate. Which fabrics are best for filtering particles in the air?

A: Researchers agree that the best facial covering is the one a person will wear. Equally important is the fit of the covering.

In some circumstances, the employer determines which masks/facial coverings are allowed, depending on the likelihood of coming in close proximity to someone with COVID-19. Health-care workers, hospital staff, dentists, dental assistants, teachers, firefighter and police officers, for example, may be required to wear the N95 masks, which filter 95% of particles that are 0.3 microns in size or larger. (For comparison, the diameter of a human hair is about 70 microns.) Remember, though, that N95 masks with valves do not protect those around you, because the wearer’s exhaled breath is unfiltered and allows droplets to escape.

During the early phase of the pandemic, the N95 and surgical

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Nasdaq posts worst week since March as tech shares slide

Stocks fell Friday, extending declines after a selloff a day earlier led the S&P 500 to its worst single-session drop in nearly three months.

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While ending the day off the lows of the session, each of the three major indices posted steep declines for the week, as Thursday’s rout took out gains from earlier sessions this week. The S&P 500 ended the week 2.3% lower, the Dow fell 1.8% and the Nasdaq dropped nearly 4% for its worst week since March.

The Nasdaq underperformed especially on the day, falling as much as 5% intraday Friday before paring losses, as tech stocks continued to lag. The index on Thursday had dipped back below 12,000, after crossing that threshold for the first time every just a day earlier. Apple (AAPL) shares steadied after an 8% drop on Thursday. Amazon (AMZN) and Zoom Video Communications (ZM) – both darlings of the

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