Is it true that wearing face masks is useless in preventing the contraction of the COVID-19 virus because the virus is smaller than the filter in the mask? The answer is NO The virus is small but it does not travel by itself, it travels in droplets that are too large to fit through most masks. That is why you never touch the outside of your mask Read more...

Flush toilets get the job done. They also require a network of piped water, sewer and electrical connections, the kind of vast infrastructure developing nations don't have, and likely won't, for years. That translates into a potentially lethal situation for the 2.5 billion people in the world who don't have access to modern sanitation. Last year, Read more...