We’ve conquered polio and smallpox. We’ve put a man on the moon and explored the depths of the oceans. We’ve mapped the known universe and the human genome. Yet we still haven’t found a way to get rid of head lice.
In fact, head lice are actually getting tougher (they’re becoming increasingly resistant to common treatments) and thus less susceptible to treatment.
Experts put the prevalence of louse infestation down to three factors:
Head lice mutate quickly because of their fast reproductive cycles (a female can lay an egg every 4 hours).