They speak for the trees: National Park Service rangers in California take on Redwood tree poachers.
A new study shows that Earth is on the brink of a massive extinction event.
Car exhaust, smog and other forms of air pollution can excelerate mental decline in older adults.
Rescuers save a researcher who was trapped in a cave in Germany for nearly two weeks.
Signing your kids up for therapy can be a tricky subject – and choosing an out-of-network provider can make matters worse.