Wal-Mart's long-standing plans to come to Washington, D.C., are now up in the air. The City Council passed a living wage law that would require the world's largest retailer to pay $12.50 an hour, more than the city's current $8.25 minimum wage.
Biology professor Mitch Aide uses his ears to learn about the frogs, birds and insects that are all around him. This scientist at the University of Puerto Rico is trying to track how animal populations are affected by a world that's under increasing pressure from human activities.
Aide says, "We would like to have five, 10, 20 years of data of how populations are changing."
The Chesapeake Bay once supplied half the world's oyster market. But pollution, disease and over-harvesting have nearly wiped out the population. It's a dire situation that's united former adversaries to revive the oyster ecosystem and industry.
Scientists and watermen have joined forces to plant underwater farms in the bay with a special oyster bred in a lab. Called triploid oysters, they have been selected for attributes like disease tolerance and fast growth.