Why did Congress move daylight savings time? Sophisticated recording devices might be placed in our national parks. A teenage girl benefits from gastric bypass surgery.
Scientists turn to tree rings to learn more about our climate's history.
In episode one of The Sound of Science, find out how air bags relate to video games, which predator might dethrone polar bears as the top of the food chain in the Arctic, and how a dust cloud circumnavigates the globe.
Climate change may be affecting the bears' habitat.
Getting to know Frances Beinecke, the new president of Natural Resource Defense Council.
Shoddy bathroom plumbing provides an easy route for viruses to spread.
-- asks David from Internetland