Uncategorized

  1. Anthropology

    A 104-centimeter-long hair could rewrite recordkeeping in Inca society

    Analysis of the hair used in a knotted device reveals the owner’s simple diet. That suggests commoners, not just the elite, kept records in Inca society.

    By Javier Barbuzano
  2. Physics

    Sunlight is all that’s needed to keep these tiny aircraft aloft

    Sun-powered fliers could use photophoretic forces to hover in the mesosphere, gathering data from a region off limits to planes and balloons.

    By Emily Conover
  3. Animals

    Warm autumns could be a driver in monarch butterflies’ decline

    In the lab, higher temperatures during fall migration led monarchs to break their reproductive pause, increasing their risk of death.

    By Jude Coleman
  4. Humans

    Stopping menopausal hormones may require more bone monitoring

    Women face a small rise in fracture risk within 10 years of stopping therapy, suggesting the need for additional monitoring.