Go to headlice.org.
If you wash your hair like normal they use a pure white towel to towel dry your hair the stunned lice will be all over the white towel. This in one of the tricks I have used in the past to prove to a parent their child did indeed have head lice.
You can see bugs crawling on the head of someone you are sitting or standing by. If their hair is thin or maybe very light. I have seen it twice on someone, once in line at the fair. She was obviously on a first date with a new guy and I could not think of a diplomatic way of pulling her aside and saying I can see bugs crawling all over your head.
The other one was a med aid at an ICF-MR facility that I was working in. I say the bugs and felt awful. I told the RN and she told her that she noticed them so the lady would not be embarrassed.
Head lice are at epidemic proportions and fighting them is not that hard. it takes washing the kids hair with normal shampoo and sectioning off their hair and going through it bit by bit and pulling any live bugs off, pulling individual hairs out or snipping them off to be put in the glass of alcohol.
If you suspect you have head lice then pour some rubbing alcohol over your head and comb it through. That is what the docs at the local ER did to the lobby person when she was pregnant and could not use a live shampoo. It killed the bugs and the nits never opened.