Lice can be hard to get rid of. In fact, head lice are now resistant to many over-the-counter treatments. Turns out, lice are a problem humans have been itching to fix for over 7 million years. Lice are small, tricky to spot, and can even hold their breath for eight hours, so they’ll be fine in the shower or in a pool. They’ve also developed resistance to many of our common treatments. In the last decade, experts have developed new weapons of attack, but we still haven’t managed to eradicate them altogether.
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