Biting Back

If you can't beat 'em, change 'em. With malaria causing almost 3 million deaths each year worldwide and mosquitoes being the primary culprit, researchers at Johns Hopkins University genetically engineered insects that were resistant to the malaria parasite. But don't trade in your long-sleeved shirts yet; so far, the mosquitoes have been tested only against a version of the malaria bug that sickens mice.

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