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  1. Materials Science

    X Rays to Go: Carbon nanotubes could shrink machines

    A new type of X-ray machine operates at room temperature by producing X-ray-generating electrons with carbon nanotubes instead of traditional heated metal filaments.

    By Jessica Gorman
  2. Health & Medicine

    Sex, smell and appetite

    A study of sexual dysfunction in mutated mice may help explain the connection between smell and appetite.

    By Damaris Christensen
  3. Health & Medicine

    Hunger hormone gone awry?

    People with an inherited form of obesity caused by constant hunger pangs have higher-than-normal blood concentrations of ghrelin, a hormone believed to boost appetite.

    By Damaris Christensen
  4. Physics

    Twice-charmed particles spotted?

    Exotic cousins of protons and neutrons known as doubly-charmed baryons may have made their laboratory debut.