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About 4 million students nationallly were winnowed down to 10 finalists, including Tucson teen Raghav Ranga, rear left, for the National Geographic Bee championship in Washington.

Tucsonan Raghav Ranga now in eighth grade, finished fourth in the national finals of the National Geographic Bee, edging out 50 other state and territorial bee winners and taking home a $1,000 check. Read more»

Dr. William R. Miller, an assistant professor of biology at Baker University in Kansas, describes the new species of tardigrades, also known as a “water bears,” that were found during this year's BioBlitz at Saguaro National Park. Tardigrades, which live in moss and lichen, are dot-sized and resemble a caterpillar.

More than 2,000 schoolchildren, 1,300 members of the general public and 170 scientists took part in the BioBlitz, and at the end of the 24-hour period, 859 plant and animal species had been counted. Read more»

The Saguaro National Park.

Tucson's first BioBlitz will begin Friday and continue through Saturday, when participants can observe and records as many plant and animal species in Saguaro National Park to better understand, appreciate and protect the park. Read more»

A lioness and a cub in Botswana's Okavango Delta.

The biggest threat to African lions is humans. Some experts say lions could be extinct in the wild in as few as 10 years. But critics say lion hunting benefits African countries. The story of the dwindling lion population is told in "The Last Lions," a new documentary. (with video) Read more»