New research shows that while many cloth and medical masks fall short against tiny airborne particles, simple hacks like overmasking or using braces can dramatically improve your protection, yet only ...
A surgical mask made using indigo plants grown in Aomori Prefecture is shown at the Aomori Prefectural Government building on June 12, 2020. (Mainichi/Kanami Ikawa) AOMORI -- A traditional indigo dye ...
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