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One day, the computers at my small book shop suddenly went crazy. It displays weird characters on the screen and then shut down instantly. I could not do anything about it except to call my trusted...
Can wear a medical face mask protect you against the new coronavirus? It's a question many people are asking, including pet owners who are putting canine face masks on their dogs. If it's a re...
Medical masks are divided into inner, middle and outer layers, the inner layer is skin-friendly material (general hygienic gauze or medical non-woven fabric), the middle layer is an isolation filte...
Do fabric face masks actually work?Yes and no. They're not as effective as N-95 masks for people treating COVID-19 patients in hospitals. That being said, they're still useful because hos...
Ultraviolet light or ultraviolet light is a type of electromagnetic wave because it has a longer wavelength than X-rays and a shorter wavelength than visible light. Our sun emits ultraviolet light,...