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A California playground embraces the value of wild play.

Ten years after the storm some residents have found healing — in the arts, family and new opportunities. Others suffer lingering grief and other difficulties they trace to Katrina.

A lack of sleep can increase the risk of traffic accidents, heart attacks, diabetes and maybe even Alzheimer's disease, research suggests. Yet most people with sleep disorders don't get treatment.

The trumpeting roar of an elephant is loud. But scientists living with herds in the forests of central Africa say the deep rumbles that humans can't hear, but can feel, carry crucial messages, too.

NPR first visited Schnell Drive in St. Bernard Parish 10 years ago to speak with the Bordelon family as they rebuilt their home after Katrina's destruction. Unlike many, they're still there today.

New Orleans lost much since Hurricane Katrina, and the failed levees that flooded the city. But Gwen Thompkins says the passions that survived the flood kept her city alive too.

People in New Orleans say the city finally has the storm defense system it should have had before Hurricane Katrina — at a cost of $14.5 billion. Now someone needs to cover the cost to keep it strong.

For some insects, sound waves or vibrations are the real social media — high-speed rumbles sent through the air and along leaf stems to help the bugs claim territory, send warnings and find mates.

Colleen Bordelon's family was the first to return to their block in Saint Bernard Parish, outside New Orleans, after Hurricane Katrina. Since then, all the men in the immediate family have died.

Dozens of games and apps claim to improve your memory or make you smarter or reduce stress. But do they really? Developers say the next step is clinically valid proof of cognitive gains.