Wanted: Seaweed solutions for $100,000

• Companies could win $100,000 for their ideas.

Why it matters: Decomposing sargassum releases gas that can smell bad, irritate eyes and repel tourists.

• Miami-Dade County spent over $4.2 million on sargassum cleanup last year.

Context: Researchers are already turning sargassum into fertilizers, fuel and bricks.

Details: Submit proposals by Sept. 29.

• Winners will be selected by the fall and then work with the county to test their solutions.

Of note: MDIA is a new nonprofit that provides grants to companies working on pressing issues like climate, health and housing.

• Launched with funding from the county, the Knight Foundation and Citadel founder Ken Griffin, it aims to host three such public challenges annually.