Environment

Hurricane Katrina blitzed the Gulf Coast four years ago Saturday. Ever since then, researchers from the University of Southern Mississippi have been collecting the stories of those who survived the storm — and its aftermath.

How is New Orleans holding up four years after Katrina? Author Tom Piazza's new novel City of Refuge traces the journeys of a handful of locals — some who died, others scattered across the country. Piazza tells Guy Raz that New Orleans is slowly getting to be New Orleans again.

How is New Orleans holding up four years after Katrina? Author Tom Piazza's new novel City of Refuge traces the journeys of a handful of locals — some who died, others scattered across the country. Piazza tells Guy Raz that New Orleans is slowly getting to be New Orleans again.

Four years after Hurricane Katrina, Louisiana residents Donald and Colleen Bordelon say things are looking better. The construction on their house is finally complete. But their struggles aren't over — and there are some things they'll never get back.

Four years after Hurricane Katrina, Louisiana residents Donald and Colleen Bordelon say things are looking better. The construction on their house is finally complete. But their struggles aren't over — and there are some things they'll never get back.

This week marks four years since Hurricane Katrina swept through New Orleans and parts of Mississippi, displacing hundreds of thousands. Tell Me More has followed the recovery of one New Orleans resident Gralen Banks in his quest for normalcy as he attempts to reclaim the life he once knew.

It's not often you get to see a giant sea creature up close and personal. But the arrival of swarms of giant Humboldt squid in southern California has given scuba divers a rare treat. Nigella Hillgarth, executive director of the Birch Aquarium at Scripps Institution of Oceanography in San Diego, offers her insight.

It's not often you get to see a giant sea creature up close and personal. But the arrival of swarms of giant Humboldt squid in southern California has given scuba divers a rare treat. Nigella Hillgarth, executive director of the Birch Aquarium at Scripps Institution of Oceanography in San Diego, offers her insight.

Summers in Phoenix can be long and lethal for those who can't escape the heat. Those who live in it say the heat makes them irritable, disoriented and unable to eat. Even at night, the temperature can hover in the lower 90s.

Summertime doesn't have to mean hours behind the lawn mower, at least for shade-dwellers. Forty years ago, David Benner, horticulturist and moss enthusiast, killed all the grass on his property and cultivated moss in its place. Benner has 25 different moss species growing in his garden near New Hope, Pa.