Black lights do not show germs directly. They can make certain substances, like some bodily fluids or certain materials, glow under ultraviolet light, but this is not a reliable method for detecting germs. To see germs, you would need a microscope or other specific testing methods.
More germs are in the hair than hands!
From dirty things, direct contact(from other people) and others.
A person has more germs in their mouth than on their hands. Saliva has enzymes that prevent germs from forming, while your hands touch things such as doorknobs all day which are infested with germs.
Germs can spread from your hands to surfaces, objects, or other people when you don't wash your hands after using the bathroom. Touching your face, shaking hands, or touching shared items can then transfer those germs to others, potentially causing illness. Washing your hands properly helps prevent this spread of germs.
Billions.
by not washing hands ?
yes!
The life span of germs on hands can vary depending on the type of germ and the conditions present. Generally, some germs can survive on hands for a few hours up to a few days. Regular handwashing with soap and water is important to reduce the transmission of germs.
No
Germs are of course harmful all of them are harmful! Harmful germs make people sick and cause rare diseases like blood diseases and like swine flu. Remember that germs right now are in your hands and wash them with soap and water before eating, after eating, and after going to the bathroom, since germs are also living things they can be harmful.Also germs spread when after playing in dirt you dont wash hands and touch the door of the house or school some germs spread from your hands to their hands and then they spread when someone else touches the door: go to Google, type germs and see images of those things in hands! Dont get away!
I almost think you are kidding. Everything you touch, all day, every day, puts germs on your hands.