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This summer, scientists in California are releasing 20 million mosquitoes in an effort to shrink the population of mosquitoes that can carry diseases.

It sounds counterintuitive. But the plan is to release millions of sterile male mosquitoes, which will then mate with wild female mosquitoes. The eggs the females lay won’t hatch, researchers say.

The project is called Debug Fresno and it’s being undertaken by Verily, a subsidiary of Alphabet, Google’s holding company. It’s the company’s first field study involving sterile mosquitoes in the U.S.

Scientists say the goal is to cut the population of Aedes aegypti mosquitoes — the species responsible for spreading Zika, dengue and chikungunya. A. aegypti have been present in California’s Central Valley since 2013 and have been a problem in Fresno County.

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