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.

Hot and humid days could prove a death knell for the current swine flu outbreak, at least in the Northern Hemisphere, experts say.

Advising caution and not panic, experts point out that most U.S. cases of the respiratory disease so far have been mild.

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.

Does your town bring you down? A new U.S. government study reveals regions most prone to "frequent mental distress." Hint: It may not just be the grass that's blue in Kentucky.

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.

Questions and answers about the virus everyone's talking about: Is pork safe? Do face masks work? Where did swine flu come from?

A hormone released during the digestion of certain fats triggers better memory in rats, a finding that likely holds true for humans, a new study says.

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.

After ten hours awake, self-described morning people showed reduced activity in brain areas linked to attention than their late-to-bed counterparts, brain scans show.

Led by Ashton Kutcher, celebrities on Twitter are donating thousands of mosquito nets to Africans threatened by malaria. Will it make a difference?

From not-so-humble beginnings in 1970, when 20 million participated, Earth Day has grown into a global tradition. Find out when it is, how it started, how it's evolved, and what you can do.

Scorpion venom bonded to iron oxide nanoparticles can halt the spread of brain tumors in mice by 98 percent, compared to 45 percent with the venom alone, a new study says.

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.

Although the blue-ringed octopus has long been the only species with a venomous reputation, a new study finds that all octopuses, cuttlefish, and some squid also have venom proteins.