The U.S. Postal Service is turning 250. Saturday’s anniversary comes as the agency faces financial challenges.

It has grown from serving the 13 colonies to reaching nearly 169 million addresses and employing more than 635,000 people.

A century-old fossil long mislabeled as a caterpillar has been reidentified as the first-known nonmarine lobopodian—rewriting ...

In a twist worthy of a detective novel, a long-misidentified fossil at Harvard's Museum of Comparative Zoology (MCZ) has ...

Anthrax might be more commonly thought of as a bioterrorist weapon, bringing to mind white envelopes and government buildings. But Wyoming officials warned residents on Wednesday that there’s an ...

Anthrax, which occurs naturally in soil, affects domestic and wild animals, and humans can become infected from close contact with them or animal products. The illness is not contagious.

Anthrax experts say they simply don't know what survivors like Wallace can expect in the future. Wallace says no one seems to be able to tell her when and if the symptoms will subside.

Anthrax spores can cause fatal illness if inhaled and Dugway is a major production and testing facility for the military's chemical and biological defense programs.

Anthrax most commonly occurs in wild and domestic lower vertebrates (cattle, sheep, goats, camels, antelopes and other herbivores), but it can also occur in humans.

The anthrax distributed to the 18 laboratories originated in one milliliter of live anthrax known as AG1 that was irradiated on March 18, 2014, a Defense Department official told ABC News.