An oyster shucker on Samish Island, Wash. on Puget Sound. The state is frequently forced to close beaches to oyster gatherers because of the risks of harmful algae blooms. Ted S. Warren/AP hide caption

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Ted S. Warren/AP

Battling 'Red Tide,' Scientists Map Toxic Algae To Prevent Shellfish Poisoning

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Lean finely textured beef, made by Beef Products Inc., shown before packaging. AP/Beef Products Inc. hide caption

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AP/Beef Products Inc.

Beef on display at a new Wal-Mart store in Chicago. The retailer announced it will offer consumers meat that does not contain lean finely textured beef. John Gress/Reuters /Landov hide caption

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John Gress/Reuters /Landov

Chances Are 'Pink Slime' Is In Grocery Store Beef, Too

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The U.S. Department of Agriculture says it will give schools alternatives to ground beef made with what critics have called "pink slime." mcnsonbrg@yahoo.com/iStockphoto.com hide caption

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mcnsonbrg@yahoo.com/iStockphoto.com

USDA To Give Schools More Ground Beef Choices After Outcry Over 'Pink Slime'

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"Lean, finely textured meat" made from beef trimmings is often added to ground beef as a cheap filler Daniel Acker/Landov hide caption

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Daniel Acker/Landov

Is It Safe To Eat 'Pink Slime'?

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John Clark pours raw milk into a glass at Applecheek Farm in Hyde Park, Vt. Toby Talbot/AP hide caption

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Toby Talbot/AP

Oranges for sale at a market in Rio de Janeirol. Antonio Scorza/AFP/Getty Images hide caption

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Antonio Scorza/AFP/Getty Images