threelayer

Wearing three-layer masks blocks 90% of infectious particles, experts say 

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Wearing three layers of face coverings can help protect you against infection with the novel coronavirus. Public health experts say this does not mean wearing three masks at a time.   Multiple masks may offer a measure of protection, but you will also be more likely to fiddle with an additional mask, and it makes it … Read more

Sweet surprise: Look inside Mars reveals the Red Planet’s crust resembles a three-layer cake

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Sweet surprise: NASA Insight lander’s first look inside Mars reveals the Red Planet’s crust resembles a three-layer cake The lander’s seismometer has recorded over 480 marsquakes since April 2019 Differences in how seismic waves move lets scientists evaluate the crust’s size and composition They believe Mars’ crust is about 23 miles thick,  far thicker than … Read more