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  1. Planetary Science

    A sunrise view of Mars

    The first high-resolution images sent by the Mars Reconnaissance Orbiter support the notion that water once flowed across much of the Red Planet.

    By Julie Rehmeyer

  2. Horns vs. Sperm: Male beetles on tight equipment budget

    A group of dung beetle species that sprout elaborate horns often face trade-offs between horn and testes sizes.

    By Susan Milius

  3. Autism’s DNA Trail: Gene variant tied to developmental disorder

    A study of more than 700 families with children diagnosed with autism has identified a gene variant, already known to affect brain formation, that boosts a person's chances of developing this severe disorder.

    By Bruce Bower

  4. 19746

    I am a retired high school mathematics teacher who has quilted mathematical ideas for over 20 years.