Lice

Myth #1: Having lice means that you're dirty- Truth: Lice like clean hair.  When you shampoo, the soap strips your hair of it's natural oil.  So while you think your hair is clean, it is also very grippy.  Thus, lice can hang on better to move around.- Solution: Don't wash your hair - ha!  At least allow your natural oils to stay in your hair, or use a leave in conditioner or other product that makes the hair "slippery".
Will dry shampoo attract lice if you're not washing your hair?- Dry shampoo works like baby powder - it absorbs the excess oil and moisture, but doesn't dry out the roots of your hair as soapy, foamy shampoos.
Jump on the no 'poo bandwagon!
Myth #2: Live for a long time off your hair.- Lice require a warm place and a blood supply for survival.  They like to hang out at the base of the head/neck and around your ears.  They may fall off on couches, and backpacks, and car seats, but they rarely survive there long enough to transfer to someone else.  It is mostly spread by