So if that woman somehow develops rubella, what that means is this virus is small enough to actually cross across that placental membrane. And once it enters the circulatory system of that fetus, it can cause many damaging effects. So the virus rubella basically interferes with many cellular metabolic processes and that can lead to children that are born with different types of abnormalities. For example, deafness, blindness, heart problems, mental problems and abnormalities as well as many other different types of abnormal conditions. Now let's move on to radiation. So what exactly do we mean by radiation?