In India's Sundarbans region, tiger-human conflicts are on the rise as tiger habitat and prey disappear and as rising seas push humans into tiger territory. Video.

After a factory had found a 40-million-year-old whale fossil in a limestone kitchen counter, researchers investigated the stone's fossil-packed quarry, which could shed light on the origins of African wildlife. Video.

See how a flu virus attacks, mutates, and becomes contagious—perhaps resulting in an outbreak or even pandemic. Video.

When Maria Adela Gutierrez died just weeks ago, her illness was a mystery. Now, experts have uncovered clues as to how she became Mexico's first fatality in the 2009 swine flu outbreak. Video.

Even though no cases of swine flu have been found in Egypt—in pigs or humans—the government has ordered an estimated 300,000-plus pigs slaughtered as a swine flu precaution.Video.

A South Korean research team claims to have cloned beagles with an implanted fluorescent gene. Some researchers say the technique could be applied to treatment of human diseases. Video.

Swine flu has been detected in seven countries, including New Zealand, Israel, and the U.S. But so far, all confirmed cases are in people who have traveled to, or live in, Mexico. Video.

Archaeologists in Egypt have found 53 rock tombs containing preserved mummies and painted coffins dating back as far as 4,000 years. Video.

A 94-year-old Australian woman may be the oldest person known to survive the bite of a male Sydney funnel-web spider, one of the world's deadliest spiders. Video.

An adventure ride down a section of China's Yangtze River could be the last before planned hydroelectric dams flood the rapids and alter the landscape. Video.

Braving long walks across frigid Arctic terrain, a group of British explorers is gathering vital ground-based data about the extent of sea ice shrinkage. Video.

Iraq's southern marshes were largely restored after Saddam Hussein drained them following the 1991 Gulf War. But now a drought threatens the ancient wetlands' recovery. Video.

Cleopatra and Marc Anthony are likely buried together in one of three sites at an ancient temple, archaeologists announced in Egypt Sunday. Digging starts next week. Video.

Deliberately introduced to hunt beetles, invasive cane toad populations have exploded in Australia. Now scientists propose attacking the alien species with ants that feast on cane toad flesh.Video.

In the same Chilean town where 1,500 penguins had washed up a week and a half ago, thousands of dead sardines mysteriously tuned up on beaches. Video.