Whenever a steer or cow leaves a farm in Michigan or goes to a slaughterhouse, it passes by a tag reader, and its ID number goes to a central computer that keeps track of every animal's location.
A bee inspector checks on a frame of bees to assess the colony strength near Turlock, Calif., in February. More than 30 percent of America's bee colonies died off over the winter.
Workers separate beans in the coffee warehouse in Yirgacheffe, Ethiopia. Coffee originated in Ethiopia, but now grows in more then 50 countries around the world.
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