The arrival of electronic cigarettes has raised a red flag for health officials and others who worry the activity of “vaping” nicotine will hook young people into a new addiction that could last a lifetime.
Not so long ago, most people thought that the only good microbe was a dead microbe.
But then scientists started to realize that even though some bugs can make us sick and even kill us, most don't.
In fact, in the past decade attitudes about the bacteria, fungi, viruses and other microbes living all over our bodies has almost completely turned around. Now scientists say that not only are those microbes often not harmful, we can't live without them.