Why we Say "God Bless You" After Someone Sneezes
Have you ever sneeze and someone said God bless you and you wondered why? Well this can be due to several things. One, many Christians believe that when one sneezes, their soul is thrown from their body for a short while, leaving it open to invasion of the Devil. It is also said to be the body trying to get rid of an evil presence. They think when they say God bless you, it works as a shield against evil. Others believe that sneezing make your heart stop beating and saying that makes it keep going.

Why Viruses Aren't Considered Living Things
Viruses aren't considered living things for a good reason, they don't follow the Characteristics Of Living Things. For one, they cannot grow. To be considered a living thing it must be able to grow and develop. I could stop there, but that's only one reason. Another reason is that they cannot reproduce. According to CliffsNotes they cannot reproduce but instead replicate by invading cells. Also they are acellular particals which means they aren't made up of cells.
Source: http://www.cliffsnotes.com/cliffsnotes/sciences/why-aren-t-viruses-considered-living-things