To truly understand the deep sea, scientists need to turn off the lights on their submersible vehicles. Then they can see the ghostly blue flickers of bioluminescence produced by virtually every organism of the deep.

Meet "Big Red," a new species of jellyfish that is bulbous, dusky red, and huge, nearly one meter (about three feet) in diameter, with several fleshy arms instead of tentacles, like a balloon with greedy fingers.

The dozens of diverse lemur species on Madagascar are a motley crew. Still, none look and act quite like the aye-aye. Take a closer look at this lemur, which is considered one of the world's strangest animals altogether.

Learn more about these forests, once generally dismissed as swampy wastelands but now valued as remarkably diverse and important ecosystems.

Investigate this remarkably tough plant that can live in water up to 100 times saltier than most other plants can tolerate, not to mention thrive despite twice-daily flooding by ocean tides.

In a handful of cases, humans have contracted H5N1 from birds and then passed the virus to other humans. Even so, doctors and scientists are taking great pains to prepare for the possibility of such a pandemic.

Straddling land and sea and teeming with life, mangrove forests are key to healthy coastal ecosystems. They're also among the most threatened habitats in the world. Learn more.

Thanks to an innovative grassroots organization called Yad Fon, southern Thailand's Trang Province is home to an inspiring example of ecosystem restoration. Learn more.

While technological advances are making it easier for the 21 million diabetics in the United States to manage healthy lives, diabetes is still a disease that requires vigilance. See how scientists are using stem cells to find a cure.

On cloudless, moonless nights, the stars are so bright over the remote village of Sutherland, South Africa, that a person can walk by starlight alone. Learn more about the village’s Southern African Large Telescope (SALT).