Manufacturers long ago stopped adding a cancer-causing flame retardant to children's pajamas, but federal officials failed to ban the chemical during the late 1970s and as recently as five years ago it was the most widely used fire-resistant compound in household furniture.
If you live near Lake Michigan in Chicago's North Shore, you may find sucker fish in your backyard. The Shedd Aquarium and citizen scientists are teaming up for an experiment to help track spawning of white sucker fish along the Great Lakes. (Phil Velasquez / Chicago Tribune)
Most employees at the U.S. Environmental Protection Agency shy away from the public spotlight, focusing instead on the behind-the-scenes work of enforcing laws intended to protect public health and wildlife.