Malaria infects millions of people each year, killing between 400,000 and 700,000 people—most of them children in sub-Saharan Africa. Now, scientists have developed a method for genetically modifying mosquitoes that could potentially eliminate or dramatically reduce cases of malaria. The change would prevent a certain species of mosquito from being able to reproduce, but the scientific removal of a species carries ethical questions. Plus, learn how to use “upside” and “downside.”

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