Uncategorized

  1. Paleontology

    Did fibers and filaments become feathers?

    A variety of filamentary structures on the fossil of a small theropod dinosaur recently found in China may provide new insight into the evolution of feathers.

    By Sid Perkins
  2. Health & Medicine

    Novel typhoid vaccine surpasses old ones

    A new vaccine links a sugar molecule found on the surface of the bacterium that causes typhoid fever with a genetically engineered version of the exotoxin protein, which arouses the immune system to churn out antibodies against the bacterium.

    By Nathan Seppa
  3. Anthropology

    Peru Holds Oldest New World City

    Construction of massive ceremonial buildings and residential areas at a Peruvian site began 4,000 years ago, making it the earliest known city in the Americas.