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  1. Archaeology

    Corn domestication took some unexpected twists and turns

    A DNA study challenges the idea people fully tamed maize in Mexico before the plant spread.

    By Bruce Bower
  2. Neuroscience

    Here’s a rare way that an Alzheimer’s protein can spread

    Amyloid-beta found in vials of growth hormone can move from brain to brain, a mouse study shows.

    By Laura Sanders
  3. Animals

    50 years ago, armadillos hinted that DNA wasn’t destiny

    Nine-banded armadillos have identical quadruplets. But the youngsters aren’t identical enough, and scientists 50 years ago could not figure out why.

    By Bethany Brookshire
  4. Astronomy

    The Parker Solar Probe takes its first up-close look at the sun

    NASA’s Parker Solar Probe survived its first encounter with the sun and is sending data back to Earth.