Can We Outbuild Future Coastal Flooding?
The Army Corps of Engineers is investigating sea gates and other barriers to protect New York from a future Sandy. But others have doubts.
Heard on the Air
A sudden bridge collapse in Italy has sparked interest in the safety of structures worldwide.
Bear sightings at Yosemite National Park are down, but the park's infamous traffic poses a new threat.
Researchers have identified a gene in elephants that can detect and kill cells that have damaged DNA.