When it comes to nuisances from the parasitic insect realm, lice hold an uncontested place near the top. Especially for parents of school-aged kids. There’s nothing like the mad dash to the pharmacy for pesticide-laced shampoos and fine-toothed combs to get rid of the nasty white critters. It’s safe to say, most of us see few redeeming features when it comes to these minuscule pests. But a new study may rewrite how we perceive the usefulness of nits.