On Mexico's Caribbean coast, mountains of seaweed grow

Scraping the smelly sargassum seaweed off some beaches on Mexico's resort-studded Caribbean coast has become not only a nightmare, but possibly a health threat, for the workers doing it—with the quantities washing ashore ...

Backyard mosquito spraying booms, but may be too deadly

It's an increasingly familiar sight in U.S. cities and suburbs: A van pulls up to the curb. Workers wearing gloves, masks and other protective gear strap on backpack-type mechanisms with plastic hoses, similar to leaf blowers.

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