Age-related fumbles of memory are often feared as early signs of Alzheimer's dementia, but recent research confirms an important difference. The underlying biology of the two sorts of memory loss aren't the same. And the age-related form may be reversible someday.
Known for its sparkling turquoise waters and white sand, Spain's Mediterranean beaches are developing a new reputation — for a growing number of jellyfish. Scientists blame overfishing and, possibly, climate change for the spike in stinging invertebrates.
At the Hagerman National Wildlife Refuge in Texas is where 97-year-old Karl Haller has been counting birds for decades. Haller says he plans to keep going for as long as he can. He already has been counting birds for more than 50 yers.
A nine-year study has tracked more than 800 of the massive and largely mysterious whale sharks. For the first time, researchers have tracked the sharks' far-flung migration and where they may go to give birth. (This piece initially aired Aug. 22, 2013 on Morning Edition.)
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