After a class of flame retardants called PBDEs was phased out due to links with developmental health issues, manufacturers started using another, similar group of compounds.

Self-proclaimed "forest defenders" in Atlanta are calling for a more thorough investigation into the death of a protester who was killed by authorities after officials said the activist shot a trooper. Friends say they knew 26-year-old Tortuguita, or "Little Turtle," as funny, curious and thoughtful, not the kind of person who would fire a gun on police. But authorities say that's just what Tortuguita did as they tried to clear an 85-acre forested area that's set to be developed as a police and firefighter training facility.

Scientists know that tiny particles from smoke can be inhaled deep into a person's lungs and even enter the bloodstream. But the long-term health effects of this are not fully understood.